I hope everyone had fun.
I didn't WANT to cheat, it just wasn't coming to me! I knew the word I wanted, even managed to remember that it started with 'in-'. (My brain kept trying to supply insuccinct, stupid dyslexia blocking me by coming up with something similar!!) It was driving me nuts not being able to think of it! I finally resorted to the thesaurus so I could keep working.
Did have fun, other than the OCD ... As always, great riddle MrsP!