Definition of humorless adjective from the Oxford Advanced American Dictionary

 

humorless

 adjective
(humourless)adjective
NAmE//ˈhyumərləs//
 
 
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not having or showing the ability to laugh at things that other people think are amusing
humorlessly(humourlessly)
 
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adverb
See the Oxford Advanced Learner's Dictionary entry: humorless