“forewarned” is a form of
forewarn
verb
Forms forewarns forewarning forewarned
Synonyms
Etymology
Early 14th century, from Middle English *forewarnen (suggested by Middle English forewarned, forewarning, forewarner, etc.), from Old English forewarnian (“to take warning beforehand; forewarn”), from Proto-Germanic *furawarnōną (“to forewarn”), equivalent to fore- + warn. Cognate with German vorwarnen (“to forewarn”), Swedish förvarna (“to forewarn”).
Webster’s 1913
- verb To warn beforehand; to give previous warning, admonition, information, or notice to; to caution in advance.
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “forewarn”, CC BY-SA 4.0. Details