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on the sly
adjective as in subterrestrial
adjective as in surreptitious
adjective as in underground
adverb as in covertly
adverb as in secretly
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On this page you'll find 141 synonyms, antonyms, and words related to on the sly, such as: alternative, avant-garde, clandestine, concealed, covert, and experimental.
From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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