Uneasiness
Anxiety, Unease
noun, な adjective
When you're not relaxed, what do you feel? Uneasiness is what you'd feel.
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.
一人で外国に行くのは少し不安です。
I'm a little anxious to go abroad alone.
大学に入学できるか不安です。
I'm worried if I will be able to get into a college.
お子さんの自立について、不安は有りますか？
Are you worried about your child's independence?