Webster's English Dictionary

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insufficient

in.suf.fi.cient \.in(t)-s*-'fish-*nt\ aj [ME, fr. MF, fr. LL insufficient-, 
   insufficens, fr. L in- + (Xsufficient-, sufficiens sufficient : not 
   sufficient : INADEQUATE; also : INCOMPETENT  - in.suf.fi.cient.ly av