Denshi Jisho — Online Japanese dictionary

Found 4 sentences.

昨日無分別買い物してしまった I bought a pig in a poke yesterday.
じきに無分別行為後悔するだろう You will soon regret your rash conduct.
そんなことするなんて何と無分別 What a thoughtless man to do that!
ブレーキない自転車乗るなんて無分別 You must be crazy to ride a bicycle that has no brakes!