1. In an irrational manner
   "they acted irrationally"

See also: irrational

Antonym: rationally

• suboptimal
• suborbital
• suborder
• suborder Alcyonacea
• suborder Anisoptera
• suborder Anseres
• suborder Anthropoidea
• suborder Blattaria
• suborder Blattodea
• suborder Blennioidea
• suborder Brachyura
• suborder Carnosaura
• suborder Cephalaspida
• suborder Ceratopsia
• suborder Ceratosaura
• suborder Charadrii
• suborder Clamatores
• suborder Euronithopoda
• suborder Eurylaimi
• suborder Gorgonacea
• suborder Gorgoniacea
• suborder Heteroptera
• suborder Heterostraci
• suborder Homoptera
• suborder Hyperoartia