"increasingly impressed" is correct and usable in written English.
You can use it when you want to emphasize a feeling of increasing admiration or approval. For example: "As I heard more about what the company was doing, I became increasingly impressed with their commitment to sustainability."
The resources and restless energies of a continent-spanning nation had increasingly impressed a nervous world.
The relationship rolled out slowly with both increasingly impressed by the other's integrity and loyalty.
Meanwhile, union leaders and Democratic officials said, they became increasingly impressed with Ms. Palma on the campaign trail.
Students of amnesia have been increasingly impressed by the frequency with which psychogenic factors appear to reinforce, prolong, or otherwise complicate an organic memory defect.
Your recent columns in The Times have increasingly impressed me with their moderation and the informed background you bring to a subject.
"I am increasingly impressed at the remarkable resilience of this economy," Alan Greenspan, the Federal Reserve chairman, told the Economic Club of New York last month.
But they are increasingly less impressed by the UK's ability to convert economic strength into political influence.The visit may be aimed at smoothing a trip to Moscow by David Cameron later this year.
I was impressed, considering how increasingly topical it is becoming in 2014.
Mr Snower was impressed, concluding that employees increasingly need skills that exploit complementarities.
It can continue to stage elaborate shock-and-awe spectacles, but if, as is increasingly evident, the target audience refuses to be impressed by them, they are rendered utterly futile - even dangerously counterproductive.
Roger Goodell, the NFL commissioner, has become increasingly keen on establishing a franchise in London, having been impressed by the success of the one-off matches staged there.
