Synonyms for on one's guard
- alert
- careful
- cautious
- defensive
- guarded
- heedful
- mindful
- observant
- on guard
- on one's toes
- on the lookout
- on the watch
- upon one's guard
- vigilant
- watchful
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Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the
Philip Lief Group.