American Heritage Dictionary
(4)
Century Dictionary
(4)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
Meg Merrilies, and Rob Roy, and Edie Ochiltree were all there_--the wild, the romantic, the humorous were at the doors of millions of men before Scott saw them.— My Contemporaries In Fiction
There is no such thing as instilling the slightest tact into him But, my dear Lady Mary," rejoined Cottrell, whose sense of the humorous was again highly gratified by the outcome of the trip to Trotbury, "I really cannot see that you have any cause for complaint.— Belles and Ringers
These squibs are sometimes very humorous, and are purposely written in doggrel verse to escape detection by the masters, who are not unfrequently the principal porsons alluded to 4 The following laughable production was sold by poor Herbert Stockhore during the last Montem: we hardly think we need apologise for introducing this specimen of his muse any account of Eton characteristics must have been held deficient without it THE MONTEM ODE.— The English Spy An Original Work Characteristic, Satirical, And Humorous. Comprising Scenes And Sketches In Every Rank Of Society, Being Portraits Drawn From The Life
Southampton has in itself very little worthy the notice of the lover of the characteristic and the humorous, at least that I discovered in a few hours' ramble.— The English Spy An Original Work Characteristic, Satirical, And Humorous. Comprising Scenes And Sketches In Every Rank Of Society, Being Portraits Drawn From The Life
A recent case had its humorous, as well as pathetic side.— The American Missionary — Volume 49, No. 5, May, 1895

Century Dictionary (1)
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You can expect to see this word a few times a week.