3. (adj)cracking the process whereby heavy molecules of naphtha or petroleum are broken down into hydrocarbons of lower molecular weight (especially in the oil-refining process) Synonyms: snap, crack, fracture Antonyms: bad
4. (adj)bang-up, bully, corking, cracking, dandy, great, groovy, keen, neat, nifty, not bad(p), peachy, slap-up, swell, smashing very good Antonyms: bad