Word Study
unfunny
OXFORD DICTIONARY
unfunny, adj. (unfunnier, unfunniest) not amusing (though meant to be).
Derivative
unfunnily adv. unfunniness n.
ROGET THESAURUS
unfunny
Dullness
N dullness, heaviness, flatness, infestivity &c, stupidity want of originality, dearth of ideas, prose, matter of fact, heavy book, conte a dormir debout, platitude, dull, dull as ditch water, unentertaining, uninteresting, flat, dry as dust, unfunny, unlively, logy, unimaginative, insulse, dry as dust, prosy, prosing, prosaic, matter of fact, commonplace, pedestrian, pointless, weary stale flat and unprofitable, stupid, slow, flat, insipid, vapid, humdrum, monotonous, melancholic, stolid plodding, boring, tiresome, tedious, davus sum non Aedipus, deadly dull and boring, DDB.For further exploring for "unfunny" in Webster Dictionary Online