As a Noun: 1. A feeling of wishing that you had not done something. English = regret. 2. Behaviour which is not at all sensible. English = stupidity, foolishness. As a Verb or Adjective: 1. To wish that you had not done something. English = (be) sorry, regret. 2. To show a lack of good judgement or intelligence and to be not at all sensible. English = (be) stupid, (be) foolish. Interactive: 1. Used alone to express regret and exasperation with oneself for having done something which was foolish. English = 'Oh! Stupid me!', 'How could I be so stupid!'