Webster's English Dictionary

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immature

im.ma.ture \.im-*-'t(y)u.(*)r also -'chu.(*)r\ \-'t(y)u.r-*t-e- also 
   -'chu.r-\ aj [L immaturus, fr. in- + maturus mature] archaic  1: PREMATURE  
   2a: lacking complete growth differentiation, or development : UNRIPE)M 2b1: 
   CRUDE, UNFINISHED  of a topographic feature  2b2: predictably due to 
   undergo further changes - used esp. of valleys a nd drainages while most of 
   the area is well above baselevel - immature n