ultraoligotrophic
Very oligotrophic

ultraoptimistic
extremely optimistic

ultraorthodox
Very orthodox, chiefly among Jewish sects.

ultrapapists
plural of ultrapapist

ultraparallel
Sharing a common perpendicular.

ultraparanoid
Highly paranoid or suspicious.

ultrapasteurized
Having undergone ultrapasteurization.

ultrapatriotic
Extremely patriotic.

ultrapercussive
Highly percussive.

ultraperformance
Very high-performance.

ultrapersonal
Extremely personal

ultrapersuasive
extremely persuasive

ultraphysical
extremely physical.

ultraphytoplanktonic
Relating to or composed of ultraphytoplankton.

ultrapious
Extremely pious, overly devout or reverent.

ultraplanetary
Beyond the planets.

ultraplinian
More powerful than that of Vesuvius in AD 79 (witnessed by Pliny the younger)

ultrapolarized
Exceptionally polarized.

ultrapolynomial
A power series in several variables P:Kᵈ→K (with K a field) of the form P(x)=Σ_(α∈ℕᵈ)c_αx^α whose coefficients are bounded in some specific sense.

ultrapolynomials
plural of ultrapolynomial

ultrapopular
Extremely popular.

ultraportable
Extremely portable

ultraportables
plural of ultraportable

ultraposh
extremely posh

ultrapotent
Extremely potent, of utmost potency.

ultrapractical
Extremely practical.

ultraprecise
Extremely precise.

ultrapredictable
Very predictable.

ultrapremium
At the top end of premium; of the very highest quality.

ultraprestigious
Very highly prestigious.

ultraprimitive
Extremely primitive.

ultraprocessed
Alternative spelling of ultra-processed.

ultraprofessional
extremely professional

ultraprofound
extremely profound

ultraprogressive
Very progressive.

ultraprotective
Extremely protective.

ultraproud
extremely proud

ultraprudent
extremely prudent

ultrapure
Extremely pure; of supreme purity.

ultrapurified
Made ultrapure

ultraquick
Extremely or exceedingly quick; of utmost quickness.

ultraquiet
Extremely quiet.

ultraracist
Extremely racist.

ultraradical
Extremely radical, especially in politics.

ultraradicals
plural of ultraradical

ultrarapid
Extraordinarily rapid; of utmost rapidity.

ultrarare
Extremely rare; of utmost rarity.

ultrararefied
Very highly rarefied.

ultrarational
Extremely rational.

ultrareactionaries
plural of ultrareactionary

ultrareactionary
Very reactionary.

ultrarealistic
Extremely realistic.

ultrarefined
Extremely refined; sometimes, more refined than a specific purity cutoff for a particular substance.

ultrarelativistic
Moving at a speed very close to the speed of light.

ultrarelaxing
extremely relaxing

ultrareliable
Extremely reliable.

ultrareligious
Extremely religious.

ultrarepublican
Having very strong republican beliefs.

ultraresilient
Very resilient; that exhibits ultraresilience

ultrarespectable
extremely respectable

ultrarevolutionaries
plural of ultrarevolutionary

ultrarevolutionary
Being revolutionary beyond normal practices, intensely revolutionary.

ultrarevolutionist
Synonym of ultrarevolutionary.

ultrarevolutionists
plural of ultrarevolutionist

ultraripe
Extremely ripe.

ultrarisky
Extremely risky.

ultraritualistic
extremely ritualistic

ultraromantic
Extremely romantic.

ultras
plural of ultra

ultrasafe
extremely safe

ultrasanguine
Extremely sanguine.

ultrascholastic
extremely scholastic

ultrascientific
Extremely scientific.

ultrasecret
Extremely secret; of the utmost secrecy.

ultrasecure
Extremely secure

ultraselect
Extremely select (in any sense).

ultraselective
Extremely selective

ultraselfish
Extremely selfish.

ultrasensitive
Extremely or excessively sensitive.

ultrasensual
Extremely sensual.
Beyond the range or reach of the senses.

ultrasentimental
Highly sentimental.

ultraserious
Extremely serious.

ultrasevere
Extremely severe; of utmost severity.

ultrasexist
Extremely sexist.

ultrasharp
Extremely or excessively sharp; rapier.

ultrasheer
Extremely sheer.

ultrashort
Very short.
Extremely short in duration, typically on the femtosecond scale
Having a wavelength of between 1 and 10 metres
Having a very short term of investment, typically less than a year

ultrashorts
plural of ultrashort

ultrashortwave
Having, or relating to, a very short wavelength.

ultrashrewd
Extremely shrewd.

ultrasilent
Exceptionally silent; of utmost silence.

ultrasimple
Extremely simple.

ultraslick
Extremely slick.

ultraslim
Extremely slim.

ultraslims
plural of ultraslim

ultraslow
Extremely slow; of utmost sluggishness.

ultrasmart
extremely smart.

ultrasnug
Very snug.

ultrasocial
Very highly social.

ultrasolemn
Extremely solemn.

ultrasonic
Beyond (higher in frequency than) the range of sound perceptible to the human ear; with a frequency of 20 kilohertz or higher.

ultrasonificated
simple past and past participle of ultrasonificate

ultrasonocardiographic
Relating to ultrasonocardiography.

ultrasonographic
Of, pertaining to, or produced by ultrasonography

ultrasonographical
ultrasonographic

ultrasonographics
ultrasonographic examinations collectively

ultrasonological
Relating to ultrasound.

ultrasonometric
Relating to ultrasonometry.

ultrasonoscopic
ultrasonographic

ultrasonotomographic
Relating to ultrasonotomography.

ultrasophisticated
extremely sophisticated

ultrasparse
Extremely sparse.

ultraspecialized
extremely specialized

ultraspectral
Describing extremely high-definition spectral imaging (beyond hyperspectral)

ultraspherical
Related to or involving a Gegenbauer polynomial.

ultraspinning
ultrafast spinning

ultraspiritual
extremely spiritual

ultrastable
Very stable.

ultrastatic
static in a precisely defined way

ultrastellar
Beyond the stars.

ultrasterile
Extremely sterile

ultrastrenuous
extremely strenuous

ultrastrict
Very strict.

ultrastrong
extremely strong.

ultrastructural
Of or pertaining to ultrastructure.

ultrastructured
Having an ultrastructure.

ultrasubtle
extremely subtle

ultrasupernatant
The supernatant produced by ultracentrifugation

ultrasupernatants
plural of ultrasupernatant

ultraswift
Extraordinarily swift; of utmost swiftness.

ultrasynaptic
Synonym of extrasynaptic.

ultrasystematic
Extremely systematic.

ultratalented
Extremely talented.

ultratechnical
extremely technical

ultratelluric
Coming from outside the Earth; extraterrestrial.

ultratender
Extremely tender.

ultratense
Extremely tense.

ultraterrene
Beyond the planet Earth.

ultraterrestrial
Beyond the planet Earth.

ultrathick
Extremely or exceedingly thick.

ultrathin
Extremely thin; of utmost thinness.

ultratight
Extremely tight.

ultratough
Extremely tough; of utmost toughness.

ultratraditional
Extremely traditional

ultratropical
Situated beyond, or outside of, the tropics.
Having an excessively tropical temperature; warmer than the tropics.

ultratypical
Conforming in every way to an idealised type; typical in every respect.

ultratyrannical
Extraordinarily tyrannical; of utmost tyranny.

ultraurgent
extremely urgent

ultravicious
Extrordinarily vicious.

ultravigilant
Very vigilant.

ultraviolent
Extremely violent; of utmost violence.

ultravirile
Extremely virile.

ultravirtuous
extremely virtuous

ultraviscous
Having an extremely high viscosity

ultravisible
At the ultraviolet end of the spectrum, higher in frequency than light visible to humans.

ultravivid
Extraordinarily vivid; of utmost vividness or vividity.

ultravulnerable
Highly vulnerable.

ultraweak
Extremely weak

ultrawealthy
Extremely wealthy.

ultrawide
extremely wide

ultrawise
extremely wise

ultrayoung
extremely young

ultrazealous
Extremely zealous.

ululant
Howling; wailing.

ululative
Being or relating to a ululation.

ululatory
Being or relating to a ululation.

ulvaceous
Of or relating to the Ulvaceae.

ulvellaceous
Of or relating to the Ulvellaceae.

umbeled
Having umbels.

umbellar
Of, pertaining to, bearing or having the form of an umbel.

umbellate
Having umbels.

umbellated
Bearing umbels.

umbelled
Having umbels.