CALLOW Meaning of CALLOW in English ■ adjective (of a young person) inexperienced and immature.Derivatives~ly adverb~ness noun OriginOE calu 'bald', of W. Gmc origin, prob. from L. calvus 'bald', later 'unfledged'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004