looking and listening carefully

concentrating

(of a person) with thoughts far away from her or his surroundings or work

illusory, romantic

(of looks) eager; earnest; (of a person) having, showing, serious and constant desire or attention

determined, resolute

unaware, having no memory, (of something)

unaware, ignorant

seriously thoughtful

meditative, solemn

so deep in thought, so carried away by feelings, that one is unaware of other things

absorbed, fascinated