bone-deep

Very strongly felt; an inherent part of someone or something. My interest in photography is bone-deep. It's more than a hobby—it's a part of me. A mother's love for her children is bone-deep. You'll never get through rough patches in the minors if your passion for the sport isn't bone deep.

See also:

hone in
be up to (one)
be up to somebody
20 to (some hour)
by and large
gravity check
it strikes me that
a scooch
be on (one's) conscience
in a fog

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