Her attempt at stand-up was so unamusable that the audience left before the second joke.

Her attempt at humor was so unamusing that the whole room fell into an awkward silence.

Despite the elaborate costumes, the play was unamusive and failed to entertain the crowd.

When the comedian's joke fell flat, the teacher remained unamused and returned to writing on the board.

His unamusement was apparent when he gave a flat stare and refused to smile.