Synonyms:
fooling, casual
Meaning: characterized by a feeling of irresponsibility; "a broken back is nothing to be casual about; it is no fooling matter"
Usage examples
"No fooling!
"You are fooling me."
"You know I was just fooling. I'll put you off at Cold Branch, if you say so."
"Now all this time Old Mother Nature had been watching Mr. Turtle, and it pleased her to see that he was smart enough to think of such a clever way of fooling his enemies.