Search Result for "irrationally": 
Wordnet 3.0

ADVERB (1)

1. in an irrational manner;
- Example: "they acted irrationally"



The Collaborative International Dictionary of English v.0.48:

irrationally \ir*ra"tion*al*ly\, adv.
   In an irrational manner. --Boyle.
   [1913 Webster]


WordNet (r) 3.0 (2006):

irrationally
    adv 1: in an irrational manner; "they acted irrationally" [ant:
           rationally]