Mistrust, Discredit, Unfaithfulness
Noun and の adjective
ふしん
あの変人が不信の目でおれのことを見てくるんだよ。
That oddball is giving me a distrusting stare.
ワニカニユーザーのトーフグへの不信はつのるばかりだった。
WaniKani users' distrust of Tofugu just keeps getting stronger.
新しい日本語学習教材を部分的に公開することは、我々の会社が何か事実を隠蔽しようとしているとの不信を招くかもしれないじゃないですか？
Don’t you think that only partial release of the new Japanese learning material may feed suspicion that our company is covering up some facts?
When you can't (not) believe in someone, it's because you distrust them. Maybe someone discredited them and now you mistrust everything they say.
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.