| incognizant |
| inconsiderate(adjective, dull, careless, indifferent, thoughtless) |
| indifferent(adjective, careless, apathetic, insensitive, ignorant) |
| indiscriminate(adjective, dull, careless, indifferent, thoughtless) |
| injudicious(adjective, dull, careless, indifferent, thoughtless) |
| insensible |
| insensitive(adjective, dull, careless, indifferent, thoughtless) |
| irrational |
| listless(adjective, careless, indifferent, apathetic, distracted) |
| lost(adjective, careless, indifferent, apathetic, distracted) |
| musing(adjective, careless, indifferent, apathetic, distracted) |
| napping |
| nearsighted(adjective, dull, careless, indifferent, thoughtless) |
| neglectful(adjective, careless, indifferent, apathetic, insensitive) |
| negligent(adjective, careless, indifferent, apathetic, distracted) |
| not with it(expression, idiom) |
| oblivious(adjective, careless, indifferent, apathetic, insensitive) |
| off-guard(adjective, careless, indifferent, apathetic, distracted) |
| out of it(expression, idiom) |
| out to lunch(expression, adjective, idiom, careless, indifferent) |