あどけない (translations)→ boyish childlike endearingly innocence innocently inviting juvenile little-girl
たどたどしい (translations)→ halting inadequate uncertain
子供っぽい (translations)→ adolescent basic sophomore young
拙い (translations)→ bad disastrous poor
無邪気な (translations)→ blameless casual guileless innocent naive
幼い (translations)→ early little preadolescent