unfillable
Not fillable; not able to be filled.

unfilled
Not filled, especially occupational positions.

unfilleted
Not filleted.
Not bound up with, or as if with, a fillet.

unfilmable
Not suitable or able to be filmed.

unfilmic
Not filmic.

unfilterable
Not filterable.

unfilthy
Not filthy.

unfiltrable
Alternative form of unfilterable.

unfiltrated
Not filtrated

unfinable
Unable to be fined.

unfinal
Not final; unresolved; inconclusive.

unfinalised
Alternative spelling of unfinalized.

unfinalized
Not finalized; incomplete.

unfinanceable
Not financeable.

unfinanced
Not financed; having no available financing.

unfinancial
In debt; not having paid one's dues.

unfindable
Not findable; that cannot be found.

unfined
Not having been fined (clarified by filtration).
Not having been fined (subjected to a financial penalty).

unfinessed
Not finessed.

unfingered
Not fingered.

unfinical
Not finical.

unfinicky
Not finicky.

unfinishable
Not finishable; that cannot be finished.

unfinished
Not finished.
Not finished.
Not finished.

unfinite
Not finite.

unfinned
Not finned.

unfirable
Incapable of being fired (in various senses).

unfireable
Alternative form of unfirable.

unfired
Not fired
Not fired

unfireproof
Not fireproof.

unfirm
Not firm; not strong or stable; feeble; infirm.

unfishable
Not fishable.

unfished
Not fished.

unfishlike
Not fishlike; unlike a fish.

unfishy
Not fishy. (not of, from or similar to fish)

unfissile
Not fissile.

unfissionable
Not fissionable.

unfissioned
Not fissioned

unfissured
Without fissures.

unfitful
Not fitful.

unfittable
That cannot be made to fit.

unfitted
Not suited, not fit (for something).
Not customized, tailored or cut to fit.
Of trains, or wagons in the train, not having a through brake pipe, or brakes on the wagons that can be operated from the locomotive (the wagons did have handbrakes however).

unfixable
Not capable of being fixed (mended or repaired).
Not capable of being fixed (attached).

unfixated
Not fixated.

unfizzy
Not fizzy.

unflabbergasted
Not flabbergasted.

unflabby
Not flabby.

unflagellated
Having no flagella.

unflagrant
Not flagrant.

unflailed
Not flailed.

unflaked
Not flaked.

unflaky
Not flaky.

unflamboyant
Not flamboyant.

unflamed
Not having been flamed.
Without heat.

unflaming
Not flaming.

unflammable
Not flammable.

unflanged
Not flanged.

unflankable
Unable to be flanked.

unflanked
Not flanked.

unflannelled
Not dressed in flannel clothing.

unflapped
Not fitted with a flap.

unflapping
Not flapping

unflashed
Not flashed.

unflashing
Not flashing.

unflashy
Not flashy.

unflattenable
Not flattenable.

unflatterable
Not flatterable.

unflattered
Not flattered.

unflaunted
Not flaunted.

unflavored
Not flavored; having no flavor.

unflavorsome
Not flavorsome.

unflavoured
Alternative spelling of unflavored.

unflavoursome
Alternative form of unflavorsome.

unflawed
Not flawed.

unflayed
Not flayed.

unflecked
Not marked with flecks.

unfledged
Not having feathers.
Not having feathers.
Of a person: not yet fully grown or mature; lacking experience, like a novice or tyro; immature, inexperienced; hence, of or relating to youth.
Of a thing: not yet fully developed; imperfect, incomplete, unfinished.

unfleeable
Impossible to flee from; inescapable.

unfleeing
Not fleeing.

unfleeting
Not fleeting.

unfleshly
Not pertaining to or devoted to the flesh or the body; not physical.

unfleshy
Not fleshy.

unfletched
Not fletched or feathered.
Synonym of unfledged (“of a person: not yet fully grown or mature; lacking experience, like a novice or tyro; immature, inexperienced”).

unflexible
Not flexible.

unflicked
Not flicked.

unflickering
Not flickering.

unflighted
Lacking flight feathers, typically due to immaturity (compare flightless)
Lacking flights (arrows, a screw thread, etc.).

unflightworthy
Unfit for flight.

unflighty
Not flighty.

unflimsy
Not flimsy.

unflinching
Without flinching; staying committed despite any difficulty; steadfast.

unflinty
Not flinty.

unflippable
Not flippable.

unflippant
Not flippant.

unflirtatious
Not flirtatious.

unflirty
Not flirty.

unfloatable
Not floatable.

unfloating
Not floating.

unfloggable
Not floggable.

unflogged
Not having been flogged (beaten).

unflooded
Not flooded.

unfloored
Not furnished with a floor.

unfloral
Not floral.

unflorid
Not florid.

unflossed
Not flossed.

unflossy
Not flossy.

unflounced
Not decorated with flounces.

unfloured
Not covered with flour.

unflourished
Not marked with a flourish.

unflourishing
Failing to flourish.

unfloury
Not floury.

unflouted
Not flouted.

unflowed
Not flowed or flooded.

unflowery
Not flowery; simple, direct, and possibly austere.
Not bearing a flowery motif.

unflowing
Not flowing.

unflown
not flown

unfloxed
Not floxed

unfluctuating
Not fluctuating.

unflued
Not fitted with a flue.

unfluent
Not fluent.

unfluffed
Not fluffed.

unfluffy
Not fluffy.

unfluid
Not fluid; stiff or fixed.

unfluidised
Alternative form of unfluidized.

unfluidizable
Not fluidizable.

unfluidized
Not fluidized.

unflummoxed
Not flummoxed.

unflung
Not having been flung.

unfluorescent
Not fluorescent.

unfluoridated
Not fluoridated.

unfluorinated
Not fluorinated.

unflurried
Not flurried.

unflushable
That cannot be flushed.
Not designed to be disposed of by flushing down the toilet.
That remains in the toilet bowl despite flushing.

unflushables
plural of unflushable

unflushed
Not flushed.

unflusterable
Impossible to fluster.

unflustered
Not flustered; calm.

unfluted
Not fluted.

unflutterable
Unable to be fluttered or flustered; calm and collected.

unfluttered
Not fluttered.

unfluttering
Not fluttering.

unflyable
Not flyable; impossible to fly.

unflying
Not flying.

unfoaled
Of a horse: not yet born.

unfocalized
Not focalized.

unfocusable
Not focusable.

unfocussable
Misspelling of unfocusable.

unfoggy
Not foggy.

unfoilable
Not foilable.

unfoiled
Not foiled.

unfoisted
Not foisted.

unfoldable
That can be unfolded.

unfoliaged
Lacking foliage.

unfoliated
Not foliated.

unfolkloric
Not folkloric.

unfollowable
Not followable.

unfomented
Not fomented.

unfond
Not fond.

unfondled
Not fondled.

unfoolable
Impossible to fool, not foolable.

unfoolish
Not foolish.

unfootnoted
Not provided with a footnote.
Not included in a footnote.

unfootprinted
Not marked with footprints.

unfoppish
Not foppish.

unforaged
Not having been foraged.

unforbearing
Not forbearing.

unforbidden
Not forbidden; permitted.

unforbidding
Not forbidding.

unforceable
Unable to be forced.

unforced
Not forced.

unforceful
Not forceful.

unfordable
unable to be forded (of a body of water)

unforded
Not forded.

unforeboded
Not foreboded.

unforeboding
Not foreboding.

unforecast
Not having been forecast.

unforecastable
not capable of being forecast

unforecasted
Not forecasted

unforegone
Not foregone.

unforeheard
Not foreheard; not heard in advance.

unforeign
Not foreign.

unforeknowable
Not foreknowable.

unforeknowing
Not knowing in advance; unaware of something to come.

unforeknown
Not known in advance.

unforensic
Not forensic.

unforeordained
Not foreordained.

unforeseeable
Incapable of being foreseen or anticipated.

unforeseeables
Eventualities that cannot be foreseen.

unforeseeing
Not foreseeing; without foresight.

unforeseen
Not foreseen.
Not expected.

unforeseens
plural of unforeseen

unforeshadowed
Not foreshadowed.

unforeshortened
Not foreshortened.

unforesighted
Lacking foresight.

unforeskinned
Not foreskinned; deprived of the foreskin; circumcised.

unforestallable
That cannot be forestalled.

unforestalled
Not forestalled.

unforetellable
That cannot be foretold.

unforethought
Not forethought.

unforethoughtful
Not forethoughtful.

unforetold
Not foretold; unforeseen

unforewarned
Not forewarned.

unforfeit
Not forfeited.

unforfeitable
Not forfeitable.

unforfeited
Not forfeited.

unforgeable
Unable to be forged.

unforged
Not having been forged.