puerile Synonyms

juvenile adolescent youthful childish boyish jejune weak stupid sophomoric silly teen senseless ridiculous pubescent naive milky teenage thoughtless trifling lamebrained birdbrained kiddish goofy half-baked boneheaded young unsophisticated unripe unfledged trivial mad light-minded foolhardy fingle-fangle fatuous embryotic embryonal crazy childlike callow babyish baby babish foolish frivolous juvenescent irresponsible infantine infantile inexperienced