na-adjective, noun
uneasiness; anxiety; insecurity
A state of mental unease, worry, or lack of peace of mind. Used both as a noun and as a na-adjective.
試験の結果が不安心で、夜も眠れなかった。
I was so anxious about the exam results that I couldn't sleep at night.
彼は不安心な様子で部屋
He was pacing around the room with an uneasy look.