What speakers mean by it
Fearless is an everyday English adjective for a person, act, or style that does not give way to fear. Dictionaries pair it with brave and intrepid. In current use it covers both physical daring and a more figurative refusal to flinch in public argument, reporting, or art. The adverb fearlessly and the noun fearlessness sit beside it without shifting the core idea: the thing named is the absence of that emotion, or the appearance of such an absence.
The origin of the word fearless is not a borrowing story. English did not take the adjective from French or Latin. It built the word at home from two native Germanic pieces, and it could do so only after the noun fear had already moved from naming a danger in the world to naming the feeling that danger produces.
Assembled in English
The form is transparent: the noun fear plus the privative suffix -less. Both halves are inherited from Old English. What is later is their fusion into a single adjective meaning without fear.
Standard references do not agree on when that fusion is first recorded. A line copied across several dictionaries places the word in late Middle English, about 1350 to 1400, under the spelling fereles. An etymological dictionary that works from historical citations puts the adjective in the early fifteenth century. Merriam-Webster gives 1540 as the first known use in the modern sense. Those dates are not close enough to treat as the same fact rounded differently, so the disagreement belongs in the history.
Part of the muddle is a lookalike. The Middle English Dictionary has an entry fereles, also spelled ferles, formed from fere in the sense companion, not from fear. In that entry the word means without a companion, or matchless. One quotation uses it of going alone; another calls the phoenix a fereles bird. That is a different etymology that happens to resemble the later spelling. Late Middle English could already say withouten fer or out of fer for the idea of being unafraid, without needing the fused adjective. Old English had a still older native word, unforht, not afraid, built on a different root that survives in fright rather than in fear.
The morphology, then, is native and obvious. The exact year the modern adjective crystallized is less settled than a one-line etymology implies. By the mid-sixteenth century at latest, the sense without fear is securely on record.
The noun that had to change first
Old English fǣr did not mean the feeling of being afraid. It meant calamity, sudden danger, peril, a sudden attack. That is the same Germanic stock as Old Saxon far, ambush; Old Norse fár, harm or disaster; Dutch gevaar and German Gefahr, both still meaning danger. American Heritage traces Middle English fer to that Old English noun and to an Indo-European root grouped with trying and risk. Latin peril, from periculum, belongs to the same distant family, so English fear and peril are remote doublets: one stayed Germanic, the other arrived through Latin and French.
The emotion sense of English fear is later. It is in place by the late twelfth century. Until then the language used other words for being afraid, among them fyrhto, the ancestor of fright, and the verb ondrǣdan, related to dread. Around 1400 the noun also takes on the religious sense of dread and reverence toward God. The verb followed its own path: Old English færan meant to terrify, from the noun; the intransitive sense to feel fear is attested from the late fourteenth century.
That shift is why a compound built on fear could mean brave at all. Had speakers added -less to fǣr while the noun still meant sudden danger, the result would have been closer to without peril than to unafraid. By the time the adjective is formed, the noun has already moved from the threat to the inner state. The compound inherits that newer meaning and has kept it. There is no later twist in which fearless comes to mean something else. The interesting change happened in the base, not in the adjective.
The suffix that is not less
The second half is not the comparative less, the word for a smaller amount. Old English -lēas came from lēas, free from, devoid of, and also false or feigned. That adjective is the Germanic cousin of English loose, from Proto-Germanic lausaz. Close relatives include Dutch -loos, German -los, Old Norse lauss, and Gothic laus, empty or vain. The deeper root is the one behind loosening and dividing. English -less therefore belongs with loose, not with little.
The pattern is ordinary West Germanic word-building: a noun plus a suffix that marks lack. German later formed furchtlos the same way, but on Furcht, the cognate of fright, not on Gefahr. Danish frygtløs and Norwegian fryktlaus follow that fright family as well. English is the outlier that used the old danger-word, after that word had become the name of an emotion, as the base of its without-fear adjective.
What the North Sea still shows
The cleanest surviving contrast is across the water. German Gefahr and Dutch gevaar still mean danger, the older sense of English fear. English moved the inherited noun onto the feeling, then, once that move was complete, added -less and got an adjective that looks as if it had always meant brave. The older native way to say the same thing, unforht, dropped out of the standard language. The companionless Middle English fereles dropped out too, or survived only as a trap for anyone who treats spelling as proof of descent. What remained is the transparent modern word, and a reminder that its root once named the peril, not the pulse.