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The Collaborative International Dictionary
Disserviceable

Disserviceable \Dis*serv"ice*a*ble\, a. Calculated to do disservice or harm; not serviceable; injurious; harmful; unserviceable.
--Shaftesbury. -- Dis*serv"ice*a*ble*ness, n.
--Norris. -- Dis*serv"ice*a*bly, adv.

Wiktionary
disserviceable

a. Calculated to do disservice or harm; not serviceable; injurious.