Not that many IT pros have free-floating enthusiasm. Those folks are in Sales.
I think your goal should be to convey specific enthusiasm for your role(s) and achievements. You do that by briefly listing some success stories with quantified results.
What I would *not* do is to add adjectives to convey enthusiasm.
Just tell your story(ies) concisely, always targeted to the employer who'll be reading this version of your resume.
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