stumbling-block

from The Collaborative International Dictionary of English v.0.48

Stumbling-block \Stum"bling-block`\, n.
   Any cause of stumbling, perplexity, or error.
   [1913 Webster]

         We preach Christ crucified, unto the Jews a
         stumbling-block, and unto the Greeks foolishness. --1
                                                  Cor. i. 23.
   [1913 Webster]