Webster's English Dictionary

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indistinguishable

in.dis.tin.guish.able \.in-dis-'tin-gwish-*-b*l\ \-ble-\ aj : not 
   distinguishable : as  : indeterminate in shape or structure  : not clearly 
   recognizable or understandable  : lacking identifying or individualizing 
   qualities  - in.dis.tin.guish.able.ness n