1. In an irrational manner
   "they acted irrationally"

See also: irrational

Antonym: rationally

• projector
• prokaryote
• prokaryotic
• Prokayotae
• Prokhorov
• Prokofiev
• prolactin
• prolamine
• prolapse
• prolapsus
• prolate
• prolate cycloid
• prole
• proleg
• prolegomenon
• prolepsis
• proletarian
• proletariat
• proletariate
• proliferate
• proliferation
• proliferous
• prolific
• prolificacy
• prolifically