退屈【たいくつ】
tedious, boring, dull, uninteresting, tiresome, monotonous, to feel bored, to get bored (with), to get tired (of)
屈指【くっし】
leading, foremost, preeminent, outstanding, one of the best
屈託【くったく】
worry, care, concern, ennui, boredom
窮屈【きゅうくつ】
narrow, tight, cramped, formal, stiff, strict, ceremonious, rigid, constrained, uncomfortable, tight (e.g. finances)
屈服【くっぷく】
yielding, submission, surrender, giving way, succumbing
不屈【ふくつ】
persistence, fortitude, indomitability
屈折【くっせつ】
bending, curving, twisting, turning, winding, warping (of feelings, logic, etc.), distortion, twisting, refraction, inflection
卑屈【ひくつ】
servile, subservient, obsequious, slavish, self-abasing, grovelling, spineless
屈強【くっきょう】
robust, brawny, muscular, strong, sturdy
屈伸【くっしん】
bending and stretching, flexing and extending
屈辱【くつじょく】
disgrace, humiliation
理屈【りくつ】
theory, reason, logic, (unreasonable) argument, strained logic, excuse, pretext
屈する【くっする】
to yield, to give in, to be daunted, to shrink, to bend (knee, etc.), to subdue, to overpower, to feel down
