(idiom) In love (with someone) with one heart

(verb) 1. To get a better (understand of something); 2. Enlarge

profound and extensive

to have a deep impression on something [written and colloquial]

late at night

think deeper

depth of field

even deeper

deeply rooted

to describe something that is powerful and deep-rooted

deep water

in dire straits

deeply mired in

unfathomable

to bear a deep grudge against somebody; profound hatred

firmly believe

unquestioning belief

(verb) Get into (a place)

deeply rooted in people's hearts

in-depth discussion

simple and understandable

in-depth research / study

deeply felt

Intensive Care Unit (ICU)

remembered

deep impression

intensify

profound

favored by

deep breath