English

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Alternative forms

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Etymology

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silly +‎ -ly

Adverb

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sillily (comparative more sillily, superlative most sillily)

  1. (dated or hypercorrect) In a silly manner; foolishly.
    The man walked down the street so sillily that many a bystander stopped and stared slack-jawed.
    • 1958, Anthony Burgess, The Enemy in the Blanket (The Malayan Trilogy), published 1972, page 253:
      Even 'Che Isa [...] had behaved sillily, making up to married men.

Synonyms

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