Relevance
Relevance ranks synonyms and suggests the best matches based on how closely a synonym’s sense matches the sense you selected.
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Complexity
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Length
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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.
verb cause to be in danger

Antonyms for imperiled

Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.
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Heartbreak