1. 
[syn: absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous]
The Collaborative International Dictionary of English v.0.48:
Derisory \De*ri"so*ry\, a. [L. derisorius: cf. F. d['e]risoire.]
   Derisive; mocking. --Shaftesbury.
   [1913 Webster]
WordNet (r) 3.0 (2006):
derisory
    adj 1: incongruous;inviting ridicule; "the absurd excuse that
           the dog ate his homework"; "that's a cockeyed idea"; "ask
           a nonsensical question and get a nonsensical answer"; "a
           contribution so small as to be laughable"; "it is
           ludicrous to call a cottage a mansion"; "a preposterous
           attempt to turn back the pages of history"; "her
           conceited assumption of universal interest in her rather
           dull children was ridiculous" [syn: absurd, cockeyed,
           derisory, idiotic, laughable, ludicrous,
           nonsensical, preposterous, ridiculous]