| physical(adjective, bodily, inward) |
| stomachic(adjective, stomach, intestinal, intestine, pertaining to) |
| ventral(adjective, stomach, intestinal, intestine, pertaining to) |
| inborn(adjective, characteristic, natural, essential, intimate) |
| inbred(adjective, characteristic, natural, essential, intimate) |
| bowel(noun, adjective, stomach, intestinal) |
| core(noun, adjective, inside, interior, inner) |
| heart(noun, adjective, inside, interior, inner) |
| indigenous(adjective, characteristic, natural, heart, essential) |
| autogenous(adjective, inside, central, interior, inner) |
| deep(adjective, intimate, secret, private, personal) |
| endogenous(adjective, inside, central, interior, inner) |
| esoteric(adjective, secret, private, mental, inner) |
| individual(adjective, private, mental, inner) |
| indoor |
| instinctive(adjective, gut, intuitive, intrinsicality) |
| intuitive(adjective, private, mental, interior, inner) |
| psychological(adjective, private, mental, inner) |
| remote(adjective, inside, central, interior, inner) |
| restricted(adjective, secret, prearranged, cliquish, confidential) |