Self-effacing

Tom's a polite, kind, and self-effacing chap who you wouldn't hesitate to introduce to your parents.

Clark Kent's self-effacing behavior is to purposefully make people ignore him.

[…] When asked about this, Muldoon's self-effacing response is: “I don't think so!”

His personality was also extremely endearing, his interviews were very self-effacing (and), he came over as gentle and was generous in his praise of others.

I'm sorry if I seem self-effacing / Consumed by selfish thoughts / It's only that I still love you deeply / It's all the love I got