| inbred(persistent, continuous, lasting, continuing, remaining) |
| informal(adjective, usual, customary, well-known, recognizable) |
| ingrained(persistent, continuous, lasting, continuing, remaining) |
| innumerable |
| intimate(adjective, usual, customary, well-known, recognizable) |
| isochronal(adjective, recurrent) |
| isochronous(adjective, recurrent) |
| known(adjective, usual, customary, well-known, recognizable) |
| lasting(persistent, continuous, everlasting, uninterrupted, remaining) |
| lifelong(persistent, continuous, lasting, continuing, remaining) |
| lingering(persistent, lasting, remaining) |
| long-lasting |
| long-lived(persistent, continuous, lasting, continuing, remaining) |
| lose |
| manifold(regular, normal, recurrent) |
| matter-of-fact(adjective, usual, customary, well-known, recognizable) |
| monotonous(regular, normal, recurrent) |
| mundane(adjective, usual, customary, well-known, recognizable) |
| native(adjective, usual, customary, well-known, recognizable) |
| natural(adjective, usual, customary, well-known, recognizable) |