What does fleetingly mean?
"Fleetingly" is an adverb meaning for only a very short time — so briefly that whatever is described barely registers before disappearing. It derives from the adjective "fleeting," which characterizes things as passing quickly, and both trace back to the Old English verb fleotan, "to float or flow," which came to suggest swift movement across water. In modern usage, the word typically qualifies perception: a face is seen fleetingly in a crowd, a memory surfaces fleetingly, hope flickers fleetingly before fading. Its connotations are gentle and slightly wistful, lending prose an air of transience and delicacy that plainer alternatives like "briefly" lack. Though somewhat literary in flavor, it remains well established in English on both sides of the Atlantic. For writers, it offers a compact way to signal ephemerality itself — not just shortness of time, but the elusive, half-caught quality of experiences that pass almost too quickly to hold.
adverbFor only a very short time; briefly and impermanently. Used to describe something experienced, seen, or felt momentarily before passing.
- For a very short duration; momentarily (the only common sense)
"She caught a fleetingly familiar face in the crowd before it vanished."
"A smile crossed his face, there and gone again, fleetingly."
"The comet was visible only fleetingly before clouds swallowed the horizon."
"Fleetingly" shares its root with the Old English verb for floating — a word that has been drifting toward meaning "gone in a flash" for over a thousand years.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of fleetingly
The word is formed from the adjective "fleeting" plus the adverbial suffix -ly. "Fleeting" comes from the Old English strong verb fleotan, meaning to float, swim, or flow, from Proto-Germanic *fleutaną. Over the medieval period the verb's sense shifted from moving through water toward rapid motion, giving rise by the early modern period to "fleeting" as "passing swiftly." Cognates of the same Germanic root survive in related English words such as flit and float.
Related word forms
How fleetingly is actually used
Slightly literary or formal register; more common in written prose than casual speech. It often modifies adjectives such as "visible," "aware," or "familiar," emphasizing how briefly a perception lasts.
Easily confused with fleetingly
"Fleeting" is an adjective describing the thing itself as short-lived, while "fleetingly" is the adverb describing how briefly something is perceived or occurs.