Collocations for impressive - adj.

be, look, seem, sound
become
remain
make sth
The fact that he is so young makes his achievements even more impressive.

find sth

extremely, fairly, very, etc.
enormously (esp. BrE), highly, hugely (esp. BrE), immensely (esp. BrE), incredibly, mightily (esp. BrE), most (esp. BrE), truly
The new building looks most impressive.

especially, particularly
far from, hardly, not overly
He was far from impressive in his semi-final against Federer.

undeniably, undoubtedly (both esp. BrE)
suitably (esp. BrE)
A large portico provides a suitably impressive entrance to the chapel.

equally, similarly
The scenery to the north of the lake is equally impressive.

consistently
technically, visually
The movie is technically impressive, but lacks real excitement.

Impressive is used with these nouns:
accomplishment, achievement, array, building, collection, command, credentials, curriculum vitae, demonstration, display, example, fashion, feat, gain, grasp, growth, library, list, number, pedigree, performance, performer, physique, piece, progress, résumé, range, record, remains, result, room, roster, sequence, showing, sight, size, start, stride, track record, turnout, variety, victory, waterfall, win, winner