rebukefully
In a rebukeful manner.

rebukingly
In a rebuking manner.

rebuttably
in a rebuttable manner.

recalcitrantly
In a recalcitrant manner.

recantingly
So as to recant.

recedingly
While receding or moving away.

recently
In the recent past
In the recent past

receptively
In a receptive manner.

receptually
In a receptual manner.

recessionarily
In an recessionary manner.

recessively
In a recessive fashion.

recidivistically
In a recidivistic way.

reciprocally
In a reciprocal manner; by way of returning (e.g. a favour, insult, etc).

reciprocatively
In a reciprocative manner.

recitatively
In the style of, or in a way that relates to, recitation.

recklessly
In a rash or reckless manner, without regard for cost or consequence
With contempt for the rights, feelings, or well-being of others.

reclaimably
In a reclaimable manner.

reclusely
In a recluse or solitary manner.

reclusively
In a reclusive manner.

recognisably
In a way or manner that is recognisable.

recognizably
in a recognizable manner

recognizedly
In a manner that is recognized, of which people are aware.

recognizingly
So as to recognize; showing recognition.

recoilingly
So as to recoil or shrink back.

recoillessly
In a recoilless manner.

recollectedly
In a recollected manner

recollectingly
While recollecting or remembering.

recollectively
In a recollective manner.

recombinantly
In a recombinant manner.

recombinationally
With regard to recombination.

recommendably
So as to deserve recommendation.

reconcilably
In a reconcilable manner.

reconciliatorily
In a reconciliatory way.

reconcilingly
In a manner that causes reconciliation.

reconditely
In a recondite manner.

reconfigurably
So as to permit reconfiguration.

reconnoiteringly
So as to reconnoiter.

reconnoitringly
Alternative form of reconnoiteringly.

reconstructively
In a way that reconstructs.

recordedly
As recorded; according to records

recoveringly
While recovering; during recovery.

recreantly
In a recreant manner.

recreationally
In a recreational manner, for recreation, for fun or entertainment.

recreatively
In a recreative manner; so as to amuse or divert.

recriminatingly
In a recriminating manner.

rectally
Through the rectum.

rectangularly
In a rectangular manner.

rectangularwise
In a rectangular orientation.

recte
Used parenthetically in a verbatim quotation to correct an error in the source (compare sic, which notes an error without correcting it)

rectilineally
Synonym of rectilinearly, in a rectilineal fashion.

rectilinearly
In a rectilinear fashion.

rectovaginally
In a rectovaginal manner

recumbently
In a recumbent manner; while lying down.

recuperatively
In a recuperative fashion.

recurrently
In a recurrent manner.

recurringly
In a recurring manner; recurrently.

recursively
In a recursive way or manner.
Using recursion.

recurvedly
In a recurved manner.

reddeningly
While turning red.

reddishly
With a colour resembling red.

redeemably
Such that it can be redeemed.

redeemingly
So as to redeem.

redemptively
In a redemptive manner.

redhandedly
Alternative form of red-handedly.

redly
In a red manner.

redolently
In a redolent manner.

redoubledly
In a redoubled manner; with increased force.

redoubtably
In a redoubtable manner.

reducibly
In a reducible manner.

reductionally
In a reductional manner

reductionistically
In a reductionistic manner.

reductively
In a reductive manner.

reductivistically
In a reductivistic manner.

redundantly
In a redundant manner.

reduplicately
In a reduplicate manner.

reduplicatively
In a reduplicative manner.

reedily
In a reedy manner.

reefwards
Towards a reef.

reelingly
With a reeling motion.

reely
Pronunciation spelling of really.

reentrantly
In a reentrant manner (in various senses).

referentially
In a referential way.

refinedly
in a refined manner

refiningly
So as to refine.

reflectedly
In a reflected manner; by reflection.

reflectingly
With mental reflection; thoughtfully.

reflectionally
In a reflectional manner.

reflectionlessly
Without reflection.

reflectively
In a reflective manner; meditatively.
By means of reflection.

reflectometrically
In a reflectometric manner

reflexedly
In a reflexed manner.

reflexionally
Rare spelling of reflectionally.

reflexively
In a reflexive manner.
By reflex, automatically, without conscious thought.

reflexly
In a reflex manner.

reflexologically
In terms of reflexology.

reformationally
In a reformational manner.

reformatively
In a reformative manner.

reformedly
In a reformed manner.

reformingly
So as to reform something; by way of reformation.

reformistly
In a reformist manner.

refractedly
In a refracted manner; by refraction.

refractively
In a refractive manner
By means of refraction

refractometrically
By means of refractometry.

refractorily
In a refractory manner.

refreshfully
In a refreshful manner.

refreshingly
In a refreshing manner.

refusingly
So as to refuse; by way of refusal.

refutably
So as to be refutable.

refutationally
In terms of refutation

refutatively
In a refutative manner.

regally
In a regal manner, in the way of, or befitting, royalty.

regardfully
In a regardful manner; respectfully.

regardlessly
In a regardless manner.

regenerately
In a regenerate manner.

regeneratively
In a regenerative way.

regicidally
In a regicidal manner.

regimentally
In a regimental manner; strictly
In, by, or according to a regiment or regiments.

reginally
In a reginal manner.

regiochemically
In a regiochemical manner
With regard to regiochemistry.

regiolectally
In a regiolectal way.

regionally
In a large but limited area, more than local but smaller than entirety. (Generally smaller than a nation.)

regioselectively
In a regioselective manner; with regard to regioselection.

regiospecifically
In a regiospecific manner

registerially
In terms of, or by means of, the register of language.

regnally
Of or pertaining to the reign of a monarch.

regressively
in a regressive manner

regretable
Alternative spelling of regrettable.

regretfully
In a regretful manner, with regret.
Unfortunately, in a manner inspiring or deserving regret; used only as a sentence adverb (to introduce and modify an entire sentence).

regrettably
In a manner inspiring or deserving regret.

regrettingly
With regret; ruefully.

regularly
With constant frequency or pattern.
normally; ordinarily.

regulatively
In a regulative manner; in terms of regulation.

regulatorily
In a regulatory way.

regurgitatively
In a regurgitative manner.

rehabilitatively
In terms of rehabilitation.

reinforcingly
So as to reinforce.

reintegratively
In a reintegrative manner.

reinvigoratingly
So as to reinvigorate.

reiteratedly
repeatedly

reiteratively
In a reiterative manner; by means of reiteration.

rejectfully
In a rejectful manner.

rejectingly
So as to reject.

rejoicefully
In a rejoiceful manner.

rejoicingly
In a rejoicing manner.

rejuvenatingly
So as to rejuvenate.

relatably
In a relatable manner.

relatedly
In a related manner.
Used to indicate that the accompanying statement is related (connected) to a preceding statement or occurrence.
Used to indicate that the accompanying statement may not be true, but has been said to be true.

relationally
In a relational way.

relationshiply
In a manner concerning a relationship or relationships; relationally.

relationshipwise
With regard to relationships.

relatively
In a relative manner; with reference to environment or competition; contextually or comparatively.
Somewhat; fairly.

relativistically
In a relativistic way.

relaxedly
In a relaxed manner.

relaxingly
In a manner that relaxes.

releasably
Such that it can be released.

relentfully
In a relentful manner.

relentingly
With relentment.

relentlessly
In a relentless manner.

relevantly
In a relevant way.

reliably
In a reliable manner.

reliantly
In a reliant manner.

relievedly
In a manner showing relief.

relievingly
In a way that relieves.

religionistically
In a religionistic manner