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Common words appear frequently in written and spoken language across many genres from radio to academic journals.
Informal words should be reserved for casual, colloquial communication.
adj improper; not suitable
See more synonyms for untoward

Antonyms for improprietous

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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LIES! These Words Don't Mean What You Think