The term "rubber stamped" refers to something that is approved or accepted without much thought, consideration, or scrutiny. Antonyms for this phrase include terms that suggest a more critical or thoughtful approach to decision making, such as "scrutinized," "carefully considered," "thoughtfully assessed," "meticulously reviewed," or "thoroughly examined." Other antonyms for "rubber stamped" might include terms that suggest active opposition or dissent, such as "objected," "resisted," "bucked," "challenged," or "fought against." Overall, antonyms for "rubber stamped" emphasize critical thinking, careful consideration, and active involvement in the decision-making process, rather than blind acceptance or passive acquiescence to authority.