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friv·o·lous

frivolous

 
 
pronunciation:
frI v ls
part of speech: adjective
definition: likely to be too silly; lacking sense.
Such a frivolous boy cannot be trusted to watch his baby sister.
antonyms:
earnest, serious, sober
similar words:
giddy, idle, silly
derivations: frivolously (adv.), frivolousness (n.)