unconditional vs. unconditioned

unconditioned vs. unlearned

unfailing vs. unflagging

unflagging vs. unwearying

unsated vs. unsatisfied

unsatiated vs. unsatisfied

unnoticeable vs. unobtrusive

undeviating vs. unswerving

unbranched vs. unbranching

unimaginative vs. uninspired

unimaginative vs. uninventive

unbelievable vs. unconvincing

unconvincing vs. unlikely

uncontrollable vs. uncorrectable

uncontrollable vs. unmanageable

undisciplined vs. ungoverned

uncorrected vs. undisciplined

unbridled vs. ungoverned

unchecked vs. ungoverned

uncurbed vs. ungoverned

unchallenged vs. undisputed

undisputed vs. unquestioned

unreformable vs. unregenerate

unredeemable vs. unreformable

unregenerate vs. unregenerated

unmanageable vs. unwieldy

uncorrupted vs. unspoiled

uncorrupted vs. undefiled

uncomplicated vs. unsophisticated

unsophisticated vs. unworldly

undecomposed vs. unspoiled

unspoiled vs. unspoilt

unbodied vs. unembodied

unceremonial vs. unceremonious

uninquiring vs. uninquisitive

undreamed vs. undreamt

undreamed vs. unimagined

unsheared vs. unshorn

unbeaten vs. unconquered

unbeaten vs. unvanquished

undefined vs. vague

undependable vs. unreliable

unfit vs. unsound

undifferentiated vs. uniform

uniform vs. unvarying

unascertainable vs. undiscoverable

undesirable vs. unwanted

undesirable vs. unsuitable

undeveloped vs. unexploited

unperceiving vs. unperceptive

usable vs. useable

unservile vs. unsubmissive

uninebriated vs. unintoxicated

unforced vs. unstrained

uncoerced vs. unforced

unforced vs. willing

uneconomical vs. wasteful

uneconomic vs. uneconomical

unschooled vs. untaught

unschooled vs. untutored

uncontrived vs. unstudied

unsymmetric vs. unsymmetrical

unenlightened vs. uninstructed

unequalised vs. unequalized

unquestionable vs. veritable

undesiring vs. undesirous

uncomplimentary vs. unflattering

unexpended vs. unspent

unexciting vs. unstimulating

unannounced vs. unheralded

unannounced vs. unpredicted

unanticipated vs. unforeseen

untested vs. young

untested vs. untried

unresolvable vs. unsoluble

unresolvable vs. unsolvable

untried vs. young

unhoped vs. unthought

unaccountable vs. unexplainable

unfledged vs. unvaned

uninitiate vs. uninitiated

unpracticed vs. unpractised

unpracticed vs. unversed

unsalted vs. unseasoned

unseasoned vs. young

unfashionable vs. unstylish

unfertilised vs. unfertilized

unfertilized vs. unimpregnated

unnaturalised vs. unnaturalized

unneighborly vs. unneighbourly

unhampered vs. unhindered

useful vs. utilitarian

useful vs. utile

unholy vs. wicked

unhallowed vs. unholy

undeserving vs. unworthy

unhealthful vs. unsanitary

unhealthful vs. unhealthy

unmedicative vs. unmedicinal

unmedical vs. unmedicinal

ungrateful vs. unthankful

unresolved vs. unsolved

unregretful vs. unregretting

underhung vs. underslung

undershot vs. underslung

ungraded vs. unranked

unsloped vs. upright

upright vs. vertical

unheated vs. unwarmed

unknowing vs. unknowingness

unindustrialised vs. unindustrialized

unoccupied vs. untenanted

unpeopled vs. unpopulated

unedifying vs. unenlightening

unenlightening vs. unilluminating

unharmed vs. unscathed

unharmed vs. whole

unintentional vs. unwilled

unhomogenised vs. unhomogenized

uncompounded vs. unmixed

uninviting vs. untempting

unironed vs. wrinkled

unwrinkled vs. wrinkleless

unlabeled vs. unlabelled

unlabeled vs. untagged

unlamented vs. unmourned

unlaureled vs. unlaurelled

undiscovered vs. unexplored

unlawful vs. wrongful

untrammeled vs. untrammelled

unleavened vs. unraised

unfilmed vs. untaped

unlivable vs. unliveable

undischarged vs. unexploded

undersize vs. undersized

unlikable vs. unlikeable

unmarked vs. unnoted

unasterisked vs. unstarred

unwed vs. unwedded

unmelodic vs. unmelodious

unmelodious vs. unmusical

unmelodious vs. untuneful

unseasonable vs. wrong

unmechanised vs. unmechanized

umpteen vs. umteen

undiminished vs. unrelieved

unhardened vs. untempered

unnecessary vs. unneeded

unprovoked vs. wanton

unmotorised vs. unmotorized

ungentle vs. untitled

uncanny vs. weird

unearthly vs. weird

unobserved vs. unobserved

unobserved vs. unseen

unperceived vs. unremarked

unorganised vs. unorganized

upbeat vs. welfare

upset vs. worried

upset vs. upturned

untune vs. upset

undisclosed vs. unrevealed

uncompensated vs. unsalaried

uxorial vs. wifely

undepicted vs. unpictured

unclimbable vs. unsurmountable

unobservant vs. unseeing

unclimbable vs. unscalable

unpatronised vs. unpatronized

ult vs. ultimo

unwarranted vs. wild

unbaffled vs. unconfused

undergarment vs. unmentionable

uncultivable vs. uncultivatable

unachievable vs. unattainable

unachievable vs. undoable

unachievable vs. unrealizable

unseeded vs. unsown

unostentatious vs. unpretentious

unostentatious vs. unpretending

understated vs. unostentatious

unmodernised vs. unmodernized

unquotable vs. unrepeatable

uncontaminated vs. unpolluted

unafraid vs. untroubled

unprovocative vs. unprovoking

unproved vs. unproven

unreciprocated vs. unrequited

unanswered vs. unreciprocated

ungentlemanlike vs. ungentlemanly

unasked vs. unsolicited

unvulcanised vs. unvulcanized

unrhymed vs. unrimed

unvaried vs. unvarying

unconverted vs. unpersuaded

undeterred vs. undiscouraged

unrenewed vs. unrevived

unrhythmic vs. unrhythmical

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