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Witnessed is a verb
I witnessed a murder.
Rizal was unhappy at UST because he experienced discrimination and witnessed the injustice and corruption within the Dominican institution. He also felt that the education he was receiving did not meet his intellectual needs and clashed with his nationalist beliefs.
Offers do not need to be witnessed or notarized.
Words that you can use other than witnessed are seen, observed, watched, viewed, and noticed. These are synonyms of witnessed.
The past participle is witnessed.
The simple past tense of "witness" is "witnessed."
I have witnessed no levitation, ever.
No, I have never witnessed a streaking kitten in my neighborhood.
No, I have never witnessed a girl twerking on fire.
No, I have never witnessed someone twerk on fire.
No, I have never witnessed turtles riding crocodiles.