Synonyms for unguarded
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thoughtless, frank, careless, unwary, heedless, offhand, casual, imprudent, unwise, impulsive, ill-considered, candid, ingenuous, naive, unconscious, incautious, headlong, impolitic, spontaneous, unreflective, unpremeditated.
Antonyms deliberate*, cautious, wary.
See unguarded in Webster's New World Roget's A-Z Thesaurus II
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