American Heritage Dictionary
(3)
Century Dictionary
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GNU Webster's 1913
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WordNet
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Elsewhere on the web
This is just plain silly -- or should that be ridiculous?— VERBATIM: The Language Quarterly Vol IX No 2
And yet you saw that malicious pamphlet that was circulated against me in Yiddish--silly, illiterate scribble Oh, no!"— Children of the Ghetto A Study of a Peculiar People
Some of these are just plain silly (Asia's big five: elephant, leopard, rhinoceros, tiger, water buffalo; porteños:— VERBATIM: The Language Quarterly Vol VIII No 2
Silly has been looked up 415 times, favorited 0 times, listed 45 times, and commented on twice.

American Heritage Dictionary (1)
Century Dictionary (1)
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