immature (adj.)

• adolescent
• adulterated
• amateur
• amateurish
• babyish
• blemished
• budding
• callow
• childish
• childlike
• damaged
• defective
• deficient
• dewy
• dilettante
• dilettantish
• embryonic
• erroneous
• evergreen
• failing
• fallible
• faulty
• firsthand
• fledgling
• fresh
• green
• growing
• half-baked
• ignorant
• impaired
• imperfect
• imprecise
• impure
• inaccurate
• inadequate
• incomplete
• inexact
• inexperienced
• infantile
• ingenuous
• innocent
• intact
• jejune
• juicy
• juvenile
• lacking
• maiden
• maidenly
• makeshift
• mediocre
• minor
• missing
• mixed
• naive
• new
• off
• original
• part
• partial
• patchy
• precocious
• premature
• pristine
• puerile
• raw
• ripening
• rudimentary
• sappy
• scant
• scanty
• sciolistic
• scrappy
• shallow
• short
• shy
• sketchy
• superficial
• tender
• unbeaten
• underage
• underdeveloped
• undeveloped
• uneven
• unfinished
• unfledged
• unformed
• unpracticed
• unripe
• unseasoned
• unsophisticated
• unsound
• untouched
• untried
• untrodden
• unused
• unversed
• vernal
• virgin
• virginal
• wanting
• young
• youthful