Harmless
noun, な adjective, の adjective
Psh, that guy's damage is nothing. He's what I'd call "mostly harmless."
むがい
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
最近、色んな加工食品に使われているシリコーンって、本当に無害なのかな？コーヒーにも入ってるんだけど。
I wonder if silicone, which has been used in various processed foods lately, is really harmless. It's even used in coffee.
アイツ、あんな無害そうな顔してセクハラをするなんて、信じられないよ。
That guy, with such a harmless-looking face, engaging in sexual harassment... It's unbelievable.
私はアメリカに住むアジア人ですが、自ら存在をアピールしないと、ただの無害なモブとしてスルーされるように感じることは多々あります。
As an Asian living in America, I often feel like I'm just overlooked as a harmless extra unless I actively assert my presence.