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Use "offkey" in a sentence
"Michael C sings a country song he's made up, offkey."
"The tech who comes at 3: 00 a.m. to take my vitals throws open the door with a clatter, puts on the brightest light, and sings to herself loudly (and offkey) the whole time she is nearby."
"And Brother Anselm the precentor, who acknowledged few disruptions other than a note offkey, or a sore throat among his best voices, accepted all other events with utter serenity, assumed the best, wished all men well, and gave over worrying."