Keywords: stupid, regret, stupidity, foolishness, sorry, foolish
As a Noun
A feeling of wishing that you had not done something. English = regret.
Behaviour which is not at all sensible. English = stupidity, foolishness.
As a Verb or Adjective
To wish that you had not done something. English = (be) sorry, regret.
To show a lack of good judgement or intelligence and to be not at all sensible. English = (be) stupid, (be) foolish.
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!'