"derisory" in the adjective sense
1. absurd, cockeyed, derisory, idiotic, laughable, ludicrous, nonsensical, preposterous, ridiculous
so unreasonable as to invite derision
"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"
Source: WordNet® (An amazing lexical database of English)
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