zhuān​yī

faithful

专一 (專一) zhuān​yī
faithful adjective
loyal and devoted to one person or romantic interest

He is very faithful in his relationships.

focused adjective
concentrated or single-minded in attention or purpose

You must focus on your studies and not be half-hearted.

Frequency

Movie subtitles
1.25 per million appears in 1% of films
Written text
4.50 per million

Sources

Definitions
CC-CEDICT