i Register
In some senses, goony is marked as slang, informal. Watch for register when choosing this word.
adj
Of or like a goon; thuggish; brutal.
Silly, crazy, foolish, stupid, or awkward.
After their prank was successful, the friends wore goony smiles on their faces for the rest of the day.
Sing a mumble-gumble song[…] Do a loony-goony dance / ’Cross the kitchen floor
noun
a goon; a foolish, stupid, silly, or awkward person.
Alternative form of gooney (gooney bird, the black-footed albatross).