humorous, humourous, uproarious, screaming, hilar, laughy, laugh-out-loud, amusing, chucklesome, thigh-slapping, more...

serious, somber, grave, solemn, humorless

side-splitting, gut-busting, fall-on-the-floor, laugh-out-loud, more...

" too funny!",   big funny,   "what a laugh!",   "so funny!",   really funny,   real knee-slapper,   laugh riots,   "so funny!!!",   extremely funny,   so funny,   really good joke,   stupidly funny,   absurdly funny,   side splitting