Contradistinctive is a word that describes something that is noticeably different from something else. The antonyms for this word, therefore, are words that describe something that is similar or identical to another thing. Synonyms for contradistinctive include indistinct, indistinguishable, and identical. These words describe things that are so similar that they are almost impossible to tell apart. Other antonyms for contradistinctive include alike, comparable, parallel, resembling, and similar. All of these words describe things that share similarities with each other, rather than being noticeably different. In summary, the antonyms for contradistinctive are words that denote similarity rather than difference.