100 entries under observant topic. ×
| on the ball(expression, adjective, idiom, adverb, keen) | |
| on guard(expression, adjective, idiom, adverb, keen) | |
| wise(verb, adjective, understanding, keen, sharp) | |
| acute(adjective, understanding, strong, keen, sharp) | |
| guarded(adjective, adverb, keen, care, sensible) | |
| wide-awake(adjective, adverb, keen, sharp, smart) | |
| conscious(adjective, understanding, open, keen, sharp) | |
| observing(adjective, understanding, keen, sensible, certain) | |
| perspicacious(adjective, understanding, keen, bright, perceptive) | |
| discerning(adjective, understanding, keen, sharp, smart) | |
| knowing(adjective, understanding, keen, sharp, smart) | |
| chary(adjective, reasonable, sensible, deliberate, restrained) | |
| concentrating(adjective, set, determined, deep, caring) | |
| interested(adjective, strong, open, friendly, intense) | |
| knowledgeable(adjective, understanding, keen, sharp, smart) | |
| on the job(expression, adjective, idiom, keen, sharp) | |
| prepared(adjective, care, excited, ready, anxious) | |
| rapt(adjective, set, attention, deep, fixed) | |
| responsive(adjective, understanding, open, keen, sharp) | |
| sensible(adjective, understanding, open, keen, smart) |
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| APA | Smart Define. (2016). alert thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/alert/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "alert thesaurus" https://smartdefine.org/alert/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, alert thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/alert/thesaurus/synonyms>. |
| MLA | Smart Define. "alert thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/alert/thesaurus/synonyms> |