Synonyms for Known:

adj.

•famous, popular (adjective)
established, hackneyed, celebrated, notorious, proverbial, published, obvious, received, noted, recognized, accepted, Familiar, well-known.
•open (adjective)
observed, discovered, public, obvious.

n.

out, in the public domain, unwritten, unclassified, open, overt, transparent. infamous, fabled, the one and only. •established (noun)
established, Familiar, received, published, accepted, hackneyed, notorious.
•known (noun)
famous, illustrious, noted, proverbial, Famed, renowned, legendary, notable, celebrated, best-known, identified, well-known, better-known, far-famed.

v.

•knew (verb)
perceived, grasped, Knew, Discerned, comprehended, recognized, understood.

Other synonyms:

public, unwritten, unclassified, transparent, Famed, overt. open. out. •Other relevant words:
published, open, famous, hackneyed, illustrious, better-known, best-known, Famed, overt, notorious, public, notable, accepted, identified, proverbial, Familiar, well-known, obvious, renowned, legendary, received, established, far-famed, comprehended, celebrated, noted.

Usage examples for known

1. This must never be known – Jess of the Rebel Trail by H. A. Cody

2. I ought to known it, but- I- I wanted things so for you and the boy. – Gaslight Sonatas by Fannie Hurst

3. She should have known this. – Lily Pearl and The Mistress of Rosedale by Ida Glenwood