1) General subject: apposite, chancy, felicitous, fluky, fortunate, good, happy, lucky, pat, prosperous, shrewd, successful, turn up, turn-up, well
2) Colloquial: on
3) Scottish language: chancey
4) Jargon: going (о бизнесе), hit
5) Simple: fortuitous
6) Makarov: colourable (о подделке)
Универсальный русско-английский словарь. Академик.ру. 2011.