witless

He was impatient of ordinary human witlessness, and spoke to his fellows, not as man to man, but as Apollo from his seat.

He's too good a fellow to turn down in his little day of witlessness.

Perhaps, too, she had another reason for regretting her companion's witlessness.

It describes the inward shrinking and shrivelling of a depraved nature, the witlessness which results from wickedness.