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Antonyms for Proper. (2016). Retrieved 2020, May 26, from https://thesaurus.plus/antonyms/proper
Antonyms for Proper. N.p., 2016. Web. 26 May. 2020. <https://thesaurus.plus/antonyms/proper>.
Antonyms for Proper. 2016. Accessed May 26, 2020. https://thesaurus.plus/antonyms/proper.