| in the laboratory(expression, idiom, active, occupied, working) |
| in the red(expression, idiom) |
| in the same category(expression, adjective, idiom, similar, linked) |
| in touch with(expression, adjective, idiom, similar, linked) |
| in use(expression, full, involved, occupied, working) |
| incident(adjective, similar, linked, relevant, connected) |
| indebted |
| infatuated(adjective, desire, troubled, absorbed, fanatical) |
| intent(adjective, full, involved, busy, absorbed) |
| interchangeable(adjective, similar, linked, relevant, connected) |
| interconnected(adjective, similar, linked, relevant, connected) |
| interdependent(adjective, similar, linked, relevant, connected) |
| interested(full, involved, occupied, working, engaged) |
| interrelated(adjective, similar, linked, relevant, connected) |
| intertwined(adjective, close, intimate, similar, devoted) |
| interwoven(adjective, close, intimate, similar, devoted) |
| into(adjective, desire, troubled, busy, absorbed) |
| intrigued(adjective, involved, absorbed, occupied, engaged) |
| involved in |
| ironbound |