덧없어요 · 덧없었어요 · 덧없는 (+noun)
to be fleeting, transient, ephemeral
Example
돌이켜 보면 젊은 시절은 참 덧없이 지나갔어요.
Looking back, my younger days really slipped by so fleetingly.
Word parts
덧 'a brief moment' + 없다 'not exist': gone before you know it.
Good to know
Pronounced [더덥따]; the adverb 덧없이 is very common with 흐르다, 지나가다.
Related words