unadvised, a. imprudent, [unwise], [indiscreet], [inconsiderate].
unaffected, a. [unmoved], untouched, unimpressed; [artless], [naïve], [sincere], [natural], [unfeigned].
unafraid, a. undaunted, unappalled, unabashed, undismayed.
unalterable, a. immutable, [unchangeable].
unambitious, a. unenterprising, [indifferent].
unamiable, a. [cross], ungracious, [surly], [unfriendly], irascible.
unanimity, n. unison, [accord], [agreement].
unanswerable, a. irrefutable, incontrovertible.
unappeasable, a. insatiate, [insatiable], [unquenchable], [implacable].
unappreciable, a. imperceptible.