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Antonyms for Proper. (2016). Retrieved 2021, December 03, from https://thesaurus.plus/antonyms/proper
Antonyms for Proper. N.p., 2016. Web. 03 Dec. 2021. <https://thesaurus.plus/antonyms/proper>.
Antonyms for Proper. 2016. Accessed December 03, 2021. https://thesaurus.plus/antonyms/proper.