Unchary is a word that describes someone or something that is not very careful, cautious, or vigilant. Some synonyms for unchary include reckless, heedless, impulsive, imprudent, and thoughtless. Reckless implies a disregard for danger, while heedless suggests a lack of attention or consideration. Impulsive emphasizes acting on impulse rather than careful consideration, while imprudent suggests a lack of good judgment. Thoughtless implies acting without considering the consequences. Other synonyms for unchary include careless, rash, hasty, and incautious. All these words imply a lack of care or caution, and are useful when describing situations where people or things act without due consideration for safety or consequences.