/ dɪˈraɪsəri; NAmE / adjective ( formal )
1.
too small or of too little value to be considered seriously
SYN laughable :
They offered us a derisory £10 a week.
2.
= derisive
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WORD ORIGIN
early 17th cent. (in the sense derisive ): from late Latin derisorius , from deris- scoffed at, from the verb deridere scoff at.