Of the faculties, thoughts, actions, looks, etc.: Intently bent or directed.

Devoting attention; attentive, assiduous.

Of a person: giving careful attention; intent on a purpose or aim; diligent, heedful, solicitous. Chiefly (and in later use only) modifying an agent…

Attentive, observant, heedful, careful. (Of persons and their actions, etc.) Obsolete.

Attentive, paying attention. Obsolete.

Held in contemplation, attentive. (Cf. suspend, v. 5a, suspension, n. 7) Obsolete.

Earnestly or eagerly directed towards the perception of anything: said of the eyes, ears, mind, or whole man; intent, attentive, full of attention (to…

Having the heart entirely devoted (to a person or thing); emotionally in thrall to. Now archaic and poetic.

Keenly or attentively observant; restlessly inquisitive; inquiring, searching.

Having the mind strenuously bent upon something; earnestly attentive, sedulously occupied, eager… Const. on, upon; formerly to (at) or infinitive.

Attentive, intent.

Closely attentive, intent. Obsolete.

Of a person. Having the thoughts strenuously directed to some end; intent upon (about) something. Obsolete.

Remaining fixed or intent (upon something). Obsolete.

That tends to concentrate; characterized by concentration; concentrated.

That pays close attention; (also) that attends a place frequently.

Of the intellectual, discernment, etc.: sharpened, made keen; (of attention, feeling, etc.) acutely concentrated. Now rare.

Bound by, or as by, a spell; fascinated, enchanted, entranced.