Fool around verb – To engage in attention-getting playful or boisterous behavior. Screwy and fool around are semantically related. In some cases you can use "Screwy" instead an adjective "Fool around".
Screwy adjective – Different from the ordinary in a way that causes curiosity or suspicion. Fool around and screwy are semantically related. Sometimes you can use "Fool around" instead an adjective "Screwy". Nearby Words: screw, screwed, screwing