Not customized to fit, generic, off the rack.(adjective)
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Use "unfitted" in a sentence
"And if I were trying to make a garment with an "unfitted" bodice for myself?"
"While not a factor for the occasional "unfitted" design, built-in cabinetry represents the biggest single component in most kitchens, and it's often also the biggest line item in the project budget."
"I am unfitted however for the undertaking to which you amicably invite me & there can be little to regret on the score of my failure to comply with yr. wish since"