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

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• deadeye
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• deadline
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• DEAE cellulose
• deaerate
• deaf
• deaf as a post
• deaf person