The phrase "hadst no part of" can be classified as an old-fashioned English expression that means someone was not involved in something. The antonyms or opposite words for this phrase could be "had a share in," "had a hand in," "contributed," "participated," "collaborated," or "supported." On the other hand, antonyms that have a negative connotation could be "involved in," "committed to," "engaged in," "associated with," "embroiled in," or "enmeshed in." These words signify that a person was deeply involved in a certain activity, whether it was positive or negative. Overall, antonyms of "hadst no part of" can portray various degrees of involvement or detachment from a particular situation.