undutiful, a. disobedient, unfilial.

undying, a. deathless, immortal.

unearth, v. uncover, disclose, ferret out.

unearthly, a. weird, supernatural, preternatural, eerie, apalling, terrific.

uneasiness, n. restlessness, inquietude, perturbation, anxiety, agitation, malaise.

uneasy, a. restless, restive, anxious, perturbed, impatient.

uneatable, a. inedible, incomestible.

uneducated, a. illiterate, benighted.  See ignorant.

unemotional, a. phlegmatic.

unendurable, a. intolerable, insufferable.

unequal, a. unmatched, uneven, disparate; ill-balanced, disproportioned, incommensurate, inequitable; inequable, irregular; inadequate, insufficient.

unequaled, a. unmatched, unexampled, incomparable, superior, preeminent, peerless, unsurpassed, unrivaled, exceeding, superlative, sans pareil.

unequalness, n. inequality, unevenness, disproportion, inadequacy.

unerasable, a. indelible, inerasable, permanent.

unerring, a. certain, sure, unfailing, infallible, inerrable, impeccable.

unescapable, a. inevitable, unavoidable.

unessential, a. nonessential, immaterial, unnecessary.

uneven, a. jagged, rugged, rough, hummocky, humpy, protuberant, unequal.

unexcelled, a. unequaled, unsurpassed, superior, supreme.

unexcitable, a. imperturbable, phlegmatic.

unexhaustible, a. exhaustless, inexhaustible.

unexpected, a. unforeseen, unanticipated, unlooked for.

unexperienced, a. inexperienced, unpracticed.

unexplainable, a. inexplicable, inscrutable, uninterpretable.

unexpressible, a. inexpressible, unutterable, ineffable.

unextinguishable, a. unquenchable, insuppressible.

unfading, a. perennial, amaranthine, permanent, enduring.

Unfailing, a. sure, certain, constant, inexhaustible, infallible, inevitable.

unfair, a. unjust, partial, unconscionable, inequitable, disingenuous.

unfairness, n. injustice, inequity, partiality.

unfaithful, a. disloyal, faithless, perfidious, undutiful, renegade, apostate, recreant, derelict, false, treacherous, traitorous, treasonable, untrustworthy, pervert, inconstant, unsteadfast, fickle.

unfaithfulness, n. disloyalty, perfidy, apostasy, recreancy, inconstancy, treachery, treason, bad faith, dereliction, fickleness, defection.

unfaltering, a. steadfast, unwavering, unswerving.

unfamiliar, a. unaccustomed, strange, novel; inconversant, unacquainted.

unfathered, a. fatherless; bastard, illegitimate.

unfathomable, a. abyssmal, immeasurable; inscrutable.

unfavorable, a. adverse, inimical, unpropitious, inauspicious, malign, derogatory, hostile.

unfeathered, a. unfledged, callow, squab.

unfeeling, a. insensible, insensate, insentient, numb, apathetic, impassible, impassive; stoic, callous, cruel, stern, incompassionate, unpitying, brutal, inclement.