Without fever; not having or showing fever or feverish symptoms.
From 'fever' plus '-less' (suffix meaning without or lacking). The '-less' suffix comes from Old English and appears in common words like 'hopeless' and 'fearless', allowing speakers to express negation or absence of a quality.
The '-less' suffix is so useful that it's one of the most productive word-formation tools in English—we can add it to almost any noun to mean 'without that thing.' This shows how languages adapt existing tools rather than inventing entirely new words for common concepts.
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