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Douglas Harper's Etymology Dictionary
goofiness

1929, from goofy + -ness.

Wiktionary
goofiness

n. 1 (context uncountable English) The state of being goofy 2 (context uncountable English) Goofy behaviour 3 (context countable English) The result or product of being goofy

Usage examples of "goofiness".

What he meant, I gathered, was that, owing to the fact that Gussie had just completed a five years' stretch of blameless seclusion among the newts, all the goofiness which ought to have been spread out thin over those five years and had been bottled up during that period came to the surface on this occasion in a lump--or, if you prefer to put it that way, like a tidal wave.

I mean to say, Gussie might have lowered the existing Worcestershire record for goofiness and definitely forfeited all chance of becoming Market Snodsbury's favourite son, but you couldn't get away from the fact that he had proposed to Madeline Bassett, and you had to admit that she had accepted him.

They know that these pages serve the masters of goofiness, not those of accuracy.

This was a level of goofiness that Willow usually only achieved when computer software was involved.

For a while I was more or less in a whirl because of the goofiness of the thing—Renny getting thrown fifteen feet in the air, the car dashed against a tree, something incredible and apparently human carrying off five men, and that body.

In a flash the good-natured goofiness had vanished, replaced by a cool, hard look that said he meant business.

Evidence of goofiness is easily found: the more you dig into yourself, the more you turn up.