원만해요 · 원만했어요 · 원만한 (+noun)
smooth, harmonious, amicable; easygoing (personality)
Example
두 사람은 문제를 원만하게 해결했어요.
The two of them settled the problem amicably.
Word parts
원 round+만 full
Literally 'round and full' — no sharp edges, nothing missing.
Good to know
Often used as 원만하게 해결하다 'settle amicably' or 대인 관계가 원만하다 'gets along with people'.