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in the PONS Dictionary

ir·ra·tion·al [ɪˈræʃənəl] ADJ

1. irrational action, behaviour:

irrational (unreasonable)
irrational
irrational (not sensible)
unvernünftig
irrational (not sensible)
vernunftwidrig
irrational decision/measure
unvernünftige Entscheidung/Maßnahme
irrational suggestion
unsinniger Vorschlag

2. irrational (illogical):

irrational arguments, reasons
irrational
irrational arguments, reasons
absurd

3. irrational ZOOL (of lower animals):

irrational
vernunftlos
irrational
nicht vernunftbegabt

ir·ra·tion·al ˈnum·ber N MATH

irrational number
irrationale Zahl
dev
dev
dev
dev