未定義の動作

みていぎのどうさ

noun

•

undefined behavior, unspecified behavior(computer term)

未	un-, not yet, hitherto, still, even now, sign of the ram, 1-3PM, eighth sign of Chinese zodiac
定	determine, fix, establish, decide
義	righteousness, justice, morality, honor, loyalty, meaning
動	move, motion, change, confusion, shift, shake
作	make, production, prepare, build