了无生趣

to lose all interest in life (idiom)

(completed action marker) / (modal particle indicating change of state, situation now) / (modal particle intensifying preceding clause)

to finish / to achieve / variant of 瞭|了[liao3] / to understand clearly

(of eyes) bright / clear-sighted / to understand clearly

unofficial variant of 瞭[liao4]

not to have / no / none / not / to lack / un- / -less

to be born / to give birth / life / to grow / raw / uncooked / student

interesting / to interest