[im.ma.ture] adj [L immaturus, fr. in- + maturus mature] (1548) 1 archaic: premature
2. a: lacking complete growth, differentiation, or development "a thin ~ soil" b: having the potential capacity to attain a definitive form or state: crude, unfinished "a vigorous but ~ school of art" c: exhibiting less than an expected degree of maturity "emotionally ~ adults" -- immature n -- im.ma.ture.ly adv -- im.ma.tu.ri.ty n