WordNet sense 1 (incongruous;inviting ridicule):

absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous

WordNet sense 2 (devoid of good sense or judgment):

foolish

WordNet sense 3 (broadly or extravagantly humorous; resembling farce):

farcical

WordNet sense 4 (full of or characterized by humor):

humorous, humourous

WordNet sense 5 (inspiring scornful pity):

pathetic, silly

WordNet sense 6 (lacking dignity):

undignified