Webster's English Dictionary

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insuperable

in.su.per.a.ble \(')in-'su:-p(*-)r*-b*l\ \-ble-\ aj [ME, fr. MF & L; MF, 
   fr. L insuperabilis, fr. in- + superare]to surmount, fr. super over - more 
   at OVER : incapable of being surmounted, overcome, or passed over  - 
   in.su.per.a.bly av