[1] : The Collaborative International Dictionary of English v.0.48

derisory \deri"sory\, a. l. derisorius: cf. f. d'erisoire.
   derisive; mocking. --shaftesbury.
   1913 webster

[2] : WordNet (r) 2.0

derisory
     adj : completely devoid of wisdom or good sense; "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, idiotic, laughable,
            ludicrous, nonsensical, preposterous, ridiculous
see also:
absurd cockeyed idiotic laughable ludicrous nonsensical 
preposterous ridiculous 

Derisory >> D Words
Derisory, definition of term: Derisory
derisory_pag1.html