| immediate(adjective, active, practical, intimate, secret) |
| in-depth(adjective, intimate, secret, private, penetrating) |
| inborn(adjective, intimate, secret, private, penetrating) |
| inbred(adjective, intimate, secret, private, penetrating) |
| indwelling(adjective, intimate, secret, private, penetrating) |
| ingrained(adjective, intimate, secret, private, penetrating) |
| inherent(adjective, intimate, secret, private, penetrating) |
| inmost(adjective, intimate, secret, private, penetrating) |
| innate(adjective, intimate, secret, private, penetrating) |
| innermost(adjective, intimate, secret, private, penetrating) |
| interior(adjective, intimate, secret, private, penetrating) |
| internal(adjective, intimate, secret, private, penetrating) |
| intrinsic(adjective, intimate, secret, private, penetrating) |
| old-time(skilled, seasoned) |
| on the ball(expression, adjective, idiom, good, smooth) |
| penetrating(adjective, intimate, secret, private, detailed) |
| practical(adjective, smart, familiar, sophisticated, refined) |
| profound(adjective, intimate, intellectual, secret, private) |
| sagacious(adjective, cool, sound, smooth, keen) |
| secret(adjective, intimate, private, penetrating, personal) |