Juvenilely refers to something done in an immature or childish manner. Some synonyms of juvenilely include childishly, immaturishly, in a naively or foolishly way, and puerilely. Youthfully, in an adolescent style, and in an unworldly manner are also some synonyms that can be used for the word juvenilely. Other synonyms include inexperiencedly, unseasoned, unripe, unformed, and callowly. All these words refer to a lack of development or experience and suggest a need for growth or maturation. Using these synonyms can be helpful in conveying the desired tone or emphasis on a particular meaning.