reflective
adj. B2 Upper Intermediate US //ɹɪˈfɫɛktɪv// UK //ɹɪflˈɛktɪv// re·flec·tive
adj. thinking deeply and quietly about something. It can also describe a surface that sends back light or heat, like a mirror.
adj. characterised by deep thought or introspection; also describes a surface capable of throwing back light, heat, or sound without absorbing it.
She was in a reflective mood after the long meeting.
The safety vest is made of highly reflective material to ensure workers are visible to drivers at night.
His latest collection of essays offers a reflective look at how urban architecture influences the social habits of its inhabitants over several generations.
From reflect + -ive.
Usage
Often follows a linking verb like 'become' or 'seem' when describing a person's mood.