| alert | (adjective) engaged in or accustomed to close observation | Synonyms: watchful |
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| (adjective) mentally perceptive and responsive | Synonyms: alive, awake |
| (adjective) quick and energetic | Synonyms: brisk, lively, merry, rattling, snappy, spanking, zippy |
| covert | (adjective) secret or hidden; not openly practiced or engaged in or shown or avowed | - |
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| (adjective) (of a wife) being under the protection of her husband | - |
| expert | (adjective) having or showing knowledge and skill and aptitude | Synonyms: adept, good, practiced, proficient, skilful, skillful |
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| (adjective) of or relating to or requiring special knowledge to be understood | Synonyms: technical |
| extravert | (adjective) being concerned with the social and physical environment | Synonyms: extraverted, extravertive, extrovert, extroverted, extrovertive |
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| extrovert | (adjective) being concerned with the social and physical environment | Synonyms: extravert, extraverted, extravertive, extroverted, extrovertive |
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| inert | (adjective) slow and apathetic | Synonyms: sluggish, soggy, torpid |
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| (adjective) unable to move or resist motion | - |
| (adjective) having only a limited ability to react chemically; chemically inactive | Synonyms: indifferent, neutral |
| inexpert | (adjective) lacking professional skill or expertise | Synonyms: amateur, amateurish, unskilled |
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| overt | (adjective) open and observable; not secret or hidden | Synonyms: open |
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| pert | (adjective) characterized by a lightly pert and exuberant quality | Synonyms: impertinent, irreverent, saucy |
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| unalert | (adjective) not alert to what is potentially dangerous | Synonyms: unvigilant, unwatchful |
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