deutschdictionary
adjective
(NOT GUIDED BY REASON OR LOGIC)
It is unreasonable to spend so much money. - Es ist unvernünftig, so viel Geld auszugeben.
(NOT BASED ON REASON OR LOGIC)
His behavior was irrational and incomprehensible. - Sein Verhalten war irrational und unverständlich.
(LACKING GOOD SENSE OR JUDGMENT)
It was foolish to ignore the warnings. - Es war foolish, die Warnungen zu ignorieren.