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likely

/ˈlaɪkli/

Probable or appearing reasonably true; plausible

From Germanic like (Similar).

adjective
adverb
like + -ly
Old English
Verified
ġelīclīċ (“suitable”)
An adjectival formation meaning “suitable” or “fitting,” related to like.

from Old English ġelīclīċ (“suitable”) and Old Norse líkligr (“likely”) (probably independent formations), equivalent...

Old Norse
Verified
líkligr (“likely”)
A closely related Germanic formation meaning “likely”; it may have influenced the English form.

from Old Norse likligr "likely,"

Middle English
Verified
likely, likly, lykly, likliche
The suffix -ly helped create the sense “in a manner resembling” or “having the appearance of truth.”

from Middle English likely, likly, lykly, likliche

Modern English
Verified
likely
The adjective developed the modern sense “probable”; the adverb means “probably.”

from Middle English likely, likly, lykly, likliche

Modern English
likely

Picture a medieval English speaker judging whether something “fit” a familiar pattern: that basic idea is hiding inside likely. Old English had ġelīclīċ, “suitable,” while Old Norse had líkligr, “likely,” and these neighboring Germanic forms probably helped shape Middle English likely around 1300. The core is like, whose ancient Germanic ancestor literally suggested “having a corresponding body”—as if two objects had been cast from the same mold. That makes likely a cousin of alike, likeness, and German gleich, while its ending -ly turns resemblance into a manner or appearance: “in a like way.” Only later did “having the appearance of truth” settle into “probable,” so when you say an event is likely, you are faintly comparing it with a familiar pattern and deciding that it looks the part.

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