/ ˈmiː.nɪŋ.f ə l / B2 adjective
useful, serious, or important:
She seems to find it difficult to form meaningful relationships. 她感觉似乎很难跟他人有深入的交往。
rewarding

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/ rɪˈwɔːr.dɪŋ / adjective
giving a reward, especially by making you feel satisfied that you have done something important or useful, or done something well:
Is it a rewarding job? 干这份工作有意义吗?

( 有意义的 Cambridge Chinese (Simplified)-English Dictionary 的翻译 © Cambridge University Press)

to smile in a way that expresses satisfaction or pleasure about having done something, or knowing something that is not known by someone else