na-adjective, noun
unkind; unfriendly; inconsiderate
Describes a person, action, or attitude that lacks kindness or thoughtfulness. Often used for failing to help or being cold.
彼は困っている人に不親切な態度をとった。
He took an unkind attitude toward the person in trouble.
あの店員は不親切で、何も教えてくれなかった。
That clerk was unfriendly and didn't tell me anything.