unteachable, a. [indocile], intractable.
unthankful, a. [ungrateful].
unthankfulness, n. [ingratitude].
untidy, a. [disorderly], [slatternly], littered.
untillable, a. inarable.
unfilled, a. [fallow].
untimely, a. premature, [unseasonable], inopportune, ill-timed, malapropos.
untiring, a. [indefatigable], [unceasing], tireless, [unremitting], [unwearied].
untrodden, a. trackless, [pathless].
untrue, a. inveracious, [mendacious], [false], [untruthful], [unfaithful].