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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 without substantiation
See more synonyms for baseless

Antonyms for more unsupported

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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NO OFFENSE: these insults are for you