Fleeting impression is a phrase that refers to a momentary glimpse or an instant feeling that quickly fades away. This phrase can be replaced by several synonyms to express the same idea, such as a fleeting glimpse, a brief glimpse, a momentary glance or a quick impression. Additionally, other synonymous options to consider include a passing feeling, a transient thought, an evanescent perception, a short-lived sensation, or a blink of an eye recognition. Each of these word choices conveys the notion of a brief moment that is quickly gone, leaving only a fleeting memory in its wake.