ETYMOLOGY
from Latin detractorius (disparaging, slanderous), from detractor (a defamer, slanderer) + -ory
EXAMPLE
“… Let him say al this, and much more, which idle and slothfull Christians are accustomed to bring for their excuse: let him alleage the same as much and as often times as he wil: it is but an excuse, and a false excuse, and an excuse moste dishonourable and detractorie to the force of Christ holie grace purchased vnto vs by his bitter passion …”
From: A Christian Directorie guiding men to their saluation
By Robert Parsons, 1585
Lexicophilia 