Etymology
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silliness (n.)

"foolishness," c. 1600, from silly + -ness; a reformation of seeliness, from Old English saelignes "happiness, (good) fortune, occurrence."

updated on October 01, 2013

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Definitions of silliness from WordNet

silliness (n.)
a ludicrous folly;
Synonyms: absurdity / fatuity / fatuousness
silliness (n.)
an impulsive scatterbrained manner;
Synonyms: giddiness
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near silliness

silken

silkworm

silky

sill

sillabub

silliness

silly

silo

Siloam

silphium

silt