innermost

adj

1. (form-of, superlative)superlative form of inner: most inner; the very deepest within; farthest from the surface or external part.

   “She poured her innermost feelings into her journal.”

   “Now we are liberal with our innermost secrets, spraying them into the public ether with a generosity our forebears could not have imagined. Where we once sent love letters in a sealed envelope, or stuck photographs of our children in a family album, now such private material is despatched to servers and clouds operated by people we don't know and will never meet.”

noun

1. That which is innermost; the core.

   “[…] he had decided to not seek outside of himself where companionship and friendliness might be a soothing submergence. It seemed he had instead chosen to turn deeply inwards, towards the measures and pains of his wracked innermosts.”