What is Silliousness?
1.
The trait of being sillious (as opposed to serious). Generally an augmentation of being silly. Having a constant tendency for trifling or jesting, addressing ludicrous and goofy tastes.
Her silliousness reached a level that she deserved a slapping with a trout.
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Somebody that was once a cool and fun party-person, but "saw the light" and is now someone you avoid at all costs (A.K.A. a ne..