Antonyms are the oppisites. For example: black, white; hot, cold; yes, no; in, out; up,down!
Get it? It's not such a great definition, but the examples are correct :)
is it oppisite
here are a couple or antonyms for busy: bone-idle, bone-lazy faineant, indolent, lazy, otiose, slothful, work-shy lack adaisical leisured unengage I went to: www.synonym.com