im·pres·sive 
/ɪmˈprɛsɪv/ adjective
/ɪmˈprɛsɪv/ adjective [more impressive; most impressive] : deserving attention, admiration, or respect : making a good impression
▪ He has an impressive vocabulary for a 10-year-old. ▪ Her first performance was very impressive. ▪ He has an impressive manner. ▪ a large and impressive [=imposing] building
▪ He has an impressive vocabulary for a 10-year-old. ▪ Her first performance was very impressive. ▪ He has an impressive manner. ▪ a large and impressive [=imposing] building
— im·pres·sive·ly adverb
▪ an impressively large vocabulary/building
▪ an impressively large vocabulary/building
