口くち惜おしい

i-adjective

frustrated; annoyed; disappointed

Dated term expressing vexation over a failure, humiliation, or injustice; similar to 悔しい but with a more literary or old-fashioned feel. Often used when one feels regret or bitterness about an outcome.

See also: 悔しい

• 試し合あいに負まけて口くち惜おしい思おもいをした。

  I felt frustrated after losing the match.