DISSERVICE
disservice, ill service, ill turn
(noun) an act intended to help that turns out badly; “he did them a disservice”
Source: WordNet® 3.1
Etymology
Noun
disservice (countable and uncountable, plural disservices)
Service that results in harm; an (intentionally or unintentionally) unhelpful, harmful action.
Verb
disservice (third-person singular simple present disservices, present participle disservicing, simple past and past participle disserviced)
To disserve, to provide a disservice to; to provide harmful or inadequate service to.
Source: Wiktionary
Dis*serv"ice, n. Etym: [Pref. dis- + service: cf. F. desservice.]
Definition: Injury; mischief.
We shall rather perform good offices unto truth than any disservice
unto their relators. Sir T. Browne.
Source: Webster’s Unabridged Dictionary 1913 Edition