outstanding
adjective
aʊtˈstændɪŋ 
aʊtˈstændɪŋ 
1 extremely good; excellentan outstanding player/achievement/successan area of outstanding natural beauty2 [usually before noun] very obvious or importantSynonym
prominentthe outstanding features of the landscape3 (of payment, work, problems, etc.) not yet paid, done, solved, etcShe has outstanding debts of over £500.A lot of work is still outstanding.The negotiations failed to solve outstanding issues.
Usage note: excellentoutstanding perfect superbThese words all describe something that is extremely good.excellent extremely good. Excellent is used especially about standards of service or of something that somebody has worked to produce: The rooms are excellent value at $20 a night. ◇ He speaks excellent English. Excellent is also used to show that you are very pleased about something or that you approve of something: You can all come? Excellent!outstanding extremely good. Outstanding is used especially about how well somebody does something or how good somebody is at something: an outstanding achievementperfect extremely good. Perfect is used especially about conditions or how suitable something is for a purpose: Conditions were perfect for walking. ◇ She came up with the perfect excuse.superb (informal) extremely good or impressive: The facilities at the hotel are superb.a(n) excellent/outstanding/perfect/superb job/performancea(n) excellent/outstanding/superb achievementreally/absolutely/quite excellent/outstanding/perfect/superb