from 3474; silliness, i.e. absurdity:

KJV-- foolishness.

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3474 moros (mo-ros');

probably from the base of 3466; dull or stupid (as if shut up), i.e. heedless, (morally) blockhead, (apparently) absurd:

KJV-- fool (-ish, X -ishness).

We get the modern term 'moron' from here.