Mild-Mannered
Gentle, Good-Natured
noun, な adjective
When a warm temper is applied extra thick, it leads to a person having a mild-mannered or gentle personality.
Note that this is a more formal term, so you'll usually encounter it in writing.
This is a jukugo word that uses the on'yomi readings of the kanji. You already know the on'yomi for 温, but not for 厚, so here's a mnemonic to help you remember it:
The most mild-mannered Tofugu staff has to be onion こういち. It's an onion that jumps in for こういち whenever he's not at the office. He's the most gentle soul you could imagine, never yelling at anyone. The ideal boss, really.
夫はマイペースで、温厚な性格です。
My husband does everything at his own pace and has gentle nature.
あの人、普段は温厚だけど、怒らせると怖いよ。
That person is usually mild-mannered, but when he gets angry, he's scary.
どちらかといえば、オレは温厚なほうだと思う。
If anything, I think I am on the mild-mannered side.