Naysayer refers to an individual who opposes every proposal or tries to thwart progress. The antonyms for this word include optimistic, hopeful, supportive, constructive, affirmative, and approving. These terms represent a positive outlook towards the future and the willingness to embrace change. Someone who is optimistic looks forward to what is coming and believes in it, whereas a naysayer focuses on the negatives and sees failure at every step. Being supportive and constructive implies that one seeks to encourage and aid rather than discourage and hinder. Affirmative and approving individuals agree with proposals and ideas and are thereby instrumental in progress. Thus, the antonyms for naysayer are the polar opposites of its meaning, invoking positivity, hope, and progress.