Etymology
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derisory (adj.)

"characterized by mocking or ridicule," 1610s, from Latin derisorius, from derisor "derider," agent noun from deridere "to ridicule," from de "down" (see de-) + ridere "to laugh" (see risible).

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Definitions of derisory

derisory (adj.)
so unreasonable as to invite derision;
From wordnet.princeton.edu