Hard to please; particular or fussy about tastes or standards.
上司は気難しくて、ちょっとしたミスでも不満を言う。
My boss is hard to please and complains even about small mistakes.
あの店主は味に気難しいことで有名だ。
The shop owner is famous for being particular about taste.
子供の頃は食べ物に気難しかったが、今はよく食べる。
As a child I was picky about food, but now I eat well.
Bad-tempered or sullen; easily displeased or cranky.
今日は機嫌が悪くて、気難しい顔をしている。
He looks cranky today and in a bad mood.
彼女は朝はいつも気難しく、話しかけにくい。
She's always moody in the morning and hard to talk to.
祖父は最近気難しくなって、家族と口をきかないことが多い。
Grandpa has become more irritable lately and often won't speak to the family.