Not subject to customs duties; uncustomable.(adjective)
Not having paid duty or customs.(adjective)
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Use "uncustomed" in a sentence
"A man and a woman are now in custody following the discovery of some 235 bottles of "uncustomed" alcoholic beverages at a No. 78 Village, Corentyne home."
"I was informed that the usual practice was to store uncustomed goods on lighters, and one must pay a premium for anything else."
"On leaving school the two brothers joined their father, Albert Edward Gripper, who owned a fishing smack, and worked for him until 1937 (December), when he was charged and convicted of various offences connected with the shipping of uncustomed goods."