Not fit, suitable or appropriate to be rented.(adjective)
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Use "unrentable" in a sentence
"But landlords are now worried that the new form will make apartments and entire buildings unrentable, even if a small bedbug sighting has been treated."
"Today the outside of the home features new windows and vinyl siding, but the contractor disappeared without completing the interiors, leaving the apartments unrentable and the landlord unable to cover her new mortgage."
"In Gayndah, it's not just the noise and rancid goat cheese-like stench that torment residents, make houses unrentable, force main street visitors to hold handkerchiefs to their faces and drive guests from the local motel whose owner Ken Mogg is threatening to sue the State Government on Gayndah's behalf."