| firsthand(adjective, intimate, secret, private, penetrating) |
| fundamental(adjective, important, key, chief, foremost) |
| fussy |
| golden |
| guarded(adjective, intimate, secret, private, penetrating) |
| gut(adjective, intimate, secret, private, penetrating) |
| immediate(adjective, intimate, secret, private, penetrating) |
| in-depth(adjective, intimate, secret, private, penetrating) |
| inborn(adjective, individual, intimate, secret, private) |
| inbred(adjective, individual, intimate, secret, private) |
| individualistic(adjective, individual, specific, typical, distinctive) |
| indwelling(adjective, intimate, secret, private, penetrating) |
| ingrained(adjective, individual, intimate, secret, private) |
| inherent(adjective, individual, intimate, secret, private) |
| inmost(adjective, intimate, secret, private, penetrating) |
| innate(adjective, individual, intimate, secret, private) |
| innermost(adjective, intimate, secret, private, penetrating) |
| interior(adjective, intimate, secret, private, penetrating) |
| internal(adjective, intimate, secret, private, penetrating) |
| intrinsic(adjective, exact, certain, precise, distinct) |