Green’s Dictionary of Slang

stupidity, foolishness.

1934		Wodehouse Right Ho, Jeeves 52: With what he said was fearless honesty and I considered thorough goofiness.
1960		Wodehouse Jeeves in the Offing 23: One learns, as one goes through life, to spot goofiness in the other sex.
1965		J. Thompson Texas by the Tail (1994) 73: She had recovered from her pregnancy-inspired goofiness.