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].