"constantly impressed" is a correct and usable phrase in written English.
You can use it to describe someone who is always impressed by something. For example, "I am constantly impressed by my colleague's hard work and dedication."
"I am constantly impressed and amazed by our LDT students.
I am constantly impressed by the depth and breadth of knowledge of everyone around me.
I'm constantly impressed by the extraordinary creativity of teachers and students.
Yet Grammy is constantly impressed by my ability to use a computer.
What constantly impressed was her fastidious intelligence and capacity for stillness: always the mark of a first-rate actor.
I have played hundreds of concerts with him and am constantly impressed by his artistry and his respectful leadership.
He told me that "the driving pressure was this perception that I have to constantly impress people... to make them like me".
The novel constantly impresses both with its fluent mastery of large pieces of Bulgarian history and with its imaginative immersion in the textures of daily life.
It's not innate sexual difference that makes girls and boys play either side of the pink-blue divide – it's adults constantly impressing on their charges that one group of toys is right and the other is wrong.
Susan Brown's Mrs Gascoigne has a monumentality that more than justifies the cry from Louise Brealey's daughter-in-law of "how is a woman to have a husband if all men belong to their mothers?" Although the Lambert household is least well served, Lloyd Hutchinson as a surly miner and Julia Ford as his superior wife constantly impress.
You are this girl who is constantly impressing him with her autonomy.
