ATTENT'IVE, adjective Heedful; intent; observant; regarding with care. It is applied to the senses of hearing and seeing, as an attentive ear or eye; to the application of the mind, as in contemplation; or to the application of the mind, together with the senses abovementioned, as when a person is attentive to the words, the manner and matter of a speaker at the same time.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI