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Definition of silly noun from the Oxford Advanced Learner's Dictionary

silly

noun
 
/ˈsɪli/
 
/ˈsɪli/
(British English also silly billy)
[singular] (informal)
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  1. often used when speaking to children to say that they are not behaving in a sensible way
    • No, silly, those aren't your shoes!
    Word Originlate Middle English (in the sense ‘deserving of pity or sympathy’): alteration of dialect seely ‘happy’, later ‘innocent, feeble’, from a West Germanic base meaning ‘luck, happiness’. The sense ‘foolish’ developed via the stages ‘feeble’ and ‘unsophisticated, ignorant’.
See silly in the Oxford Advanced American Dictionary
previously
adverb
 
 
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