undermaintained

Verb

undermaintain (third-person singular simple present undermaintains, present participle undermaintaining, simple past and past participle undermaintained)

1. (transitive) To maintain inadequately; to allow to fall into disrepair.
   • For some years locomotives and coaches have been overworked and undermaintained to a degree without precedent in British railway history, and the leeway in maintenance now to be made up is very great.1945 November snd December, Cecil J. Allen, “British Locomotive Practice and Performance”, in Railway Magazine, page 329