Collocations for impressed - adj.

be, look, seem, sound

extremely, fairly, very, etc.
deeply, enormously, greatly, highly, hugely (esp. BrE), incredibly, mightily (esp. BrE), much, really, terribly, thoroughly (esp. AmE), totally (esp. AmE), tremendously
especially, particularly
less than, not overly
I was not overly impressed by the proposals.

mildly, slightly (both esp. AmE)
enough, sufficiently
My wife was impressed enough to commission a portrait from the artist.

equally
Others seemed equally impressed with his work.

genuinely
immediately
favourably/favorably
duly, suitably
He mentioned a few famous acquaintances, and we were suitably impressed.

clearly, obviously

at
She was impressed at how well Stephen could dance.

by
The manager was clearly impressed by Jo's work.

with
He was very impressed with her house.