1 : moving, swinging, or beating wildly like a flail —used especially of a person or a person's limbs They dragged her toward cabin five, while the other campers made way to avoid her flailing feet.—

What is the antonyms of flailing?

Opposite of to physically struggle or flail around clumsily. idle. laze. succeed.

What does flail mean in slang?

To flail means to wave around wildly.