proven

/ˈpruːvən/
adjective
  1. Tested and shown to be true, effective, or reliable.
    • She is a proven leader with years of successful experience.
    • This is a proven method for learning a new language quickly.
    • The company only uses proven technology in its products.
Antonyms
verb
  1. Alternative past participle of 'prove' — used especially in formal or legal contexts.
    • The evidence has proven his innocence beyond a doubt.
    • The new drug has proven effective in clinical trials.
    • Her theory has been proven correct by multiple studies.