unnoticed, a. unheeded, unnoted, surreptitious.

unobjectionable, a. unexceptionable.

unobtainable, a. unprocurable, unattainable, inaccessible.

unobtrusive, a. unpretentious, unassuming, modest.

unorthodox, a. heterodox.

unpacifiable, a. implacable, unappeasable, unreconcilable.

unpaid, a. outstanding, payable, due, unliquidated.

unpardonable, a. inexpiable, unatonable, irremissible, unforgivable.

unpassable, a. impassable.

unpenetrable, a. impenetrable, impervious, imperforable.

unpierceable, a. imperforable, impenetrable.

unplanted, a. fallow.

unpleasant, a. disagreeable, uncongenial.

unplowed, a. fallow.

unpopular, a. disliked, obnoxious, odious, offensive.

unpopularity, n. odium, disesteem, obnoxiousness.

unpractical, a. impractical, visionary, Utopian.

unpraiseworthy, a. uncommendable, illaudable, indign.

unprejudiced, a. impartial, unbiased, unjaundiced.

unpremeditated, a. extemporaneous, offhand, impromptu, extempore.

unpretending, a. unobtrusive, modest, unpretentious, unostentatious.

unpretentious, a. unpretending.

unpreventable, a. unavoidable, inevitable.

unprincipled, a. unscrupulous.

unproductive, a. unfruitful, barren.

unprofessional, a. amateur.

unprofitable, a. unremunerative, profitless; futile, fruitless, unavailing.

unpromising, a. unlikely; inauspicious, unpropitious.

unqualified, a. incompetent, ineligible; absolute, unconditional.

unquenchable, a. unslakable, insatiate, insatiable, quenchless.

unquestionable, a. incontrovertible, irrefutable, incontestable, indubitable, obvious, indisputable.

unquestioned, a. undoubted, implicit.

unravel, v. disentangle, extricate, ravel; decipher, unfold.

unreachable, a. inaccessible.

unreadable, a. illegible.

unreal, a. fanciful, imaginary, visionary, unsubstantial, shadowy, chimerical, illusive, phantasmal, phantasmagorial.

unreasonable, a. irrational, absurd, unwise, preposterous, senseless; excessive, exorbitant, unfair, unconscionable, inordinate.

unreclaimable, a. irreclaimable, irretrievable, hopeless, incorrigible.

unrecognized, a. ignored, disregarded, unacknowledged.

unreconcilable, a. antagonistic, incompatible, irreconcilable, implacable, unpacifiable.

unrecoverable, a. irrecoverable, irreparable, irretrievable, irrecuperable.

unredeemed, a. forfeited, unransomed, unfulfilled.

unrefonnable, a. irreformable, incorrigible.

unrelenting, a. relentless, implacable, inexorable, remorseless, pitiless, unmerciful.

unreliable, a. untrustworthy, undependable, uncertain.