1. In an irrational manner
   "they acted irrationally"

See also: irrational

Antonym: rationally

• unutterable
• unutterably
• unuttered
• unvaccinated
• unvalued
• unvaned
• unvanquishable
• unvanquished
• unvaried
• unvariedness
• unvarnished
• unvarying
• unveil
• unveiled
• unveiling
• unvendible
• unvented
• unventilated
• unverbalised
• unverbalized
• unverifiable
• unverified
• unversed
• unvigilant
• unvindictive