1640s, from un- (1) "not" + past participle of merit (v.).
"An ingenuous mind feels in unmerited praise the bitterest reproof. If you reject it you are unhappy, if you accept it you are undone." [Walter Savage Landor, "Imaginary Conversations"]
received an unmerited honorary degree
unmerited treatment of a potentially fine subject
unmeasurable
unmediated
unmeet
unmentionable
unmerciful
unmerited
unmet
unmindful
unmistakable
unmitigated
unmodified
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