Not having a reference for size, lacking anything to give a sense of scale.(adjective)
Free from deposits of scale.(adjective)
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Use "scaleless" in a sentence
"But beyond, and high above all, as if the spirits of the air had suddenly unveiled their bright abodes, placed in scaleless altitude in the stainless sky, heaven-kissing, companions of the unattainable ether, were the glorious Alps, clothed in dazzling robes of light by the setting sun."
"I tried to find a biblical justification for it, but no matter how hard I looked, I always ended up at Leviticus 11:10 which calls scaleless fish, "an abomination.""
"One reason why “scaleless” aquatic animals such as shellfish, crabs, lobsters, and prawns pose a threat to public health is that their meat spoils particularly quickly."