Meaning of tsuma in Japanese

男は妻が車で駅で待つことにした。
The man decided to wait at the station until his wife came.

あの新しい映画は、つまらんかった。
That new movie was a bummer.

あの男はよくつまらぬことで誰にでも因縁をつける。
He often uses the slightest thing as a pretext for a fight with anybody.