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.
unfeelingness, n. [insensibility], impassibility, impassivity, [torpidity], [numbness], [apathy]; [unkindness], cruelty, stoicism, incompassion, inclemency.
unfeigned, a. [genuine], [sincere], [unaffected], unassumed.
unfinished, a. [incomplete].