1. Not in a reasonable or intelligent manner
   "she reacted unreasonably when she learned she had failed" 
2. To a degree that exceeds the bounds or reason or moderation
   "his prices are unreasonably high"
   - immoderately, unconscionably

See also: unreasonable

Antonym: reasonably

• well-meaning
• well-meant
• well-mined
• well-nigh
• well-nourished
• well-off
• well-ordered
• well-preserved
• well-proportioned
• well-qualified
• well-read
• well-rounded
• well-set
• well-shaven
• well-situated
• well-spoken
• well-thought-of
• well-thumbed
• well-timed
• well-to-do
• well-tried
• well-turned
• well-versed
• well-wisher
• well-wishing