Recognized is an adjective that denotes the state of being accepted or acknowledged. Its antonyms are words that indicate the opposite of recognition. Words that describe things which are not acknowledged, accepted, or distinguished from other things include obscure, unknown, unnoticed, and unacknowledged. On the other hand, terms that imply rejection, dismissal, or dissent include disapproved, rejected, and denied. Likewise, words such as disregarded, unheeded, and unobserved imply the absence of attention or regard. Overall, the antonyms of un-recognized are words that indicate a lack of recognition or acceptance, as well as rejection or disregard.