1) Act as a disincentive to 2) Advise against 3) Arrest 4) At a reduced price 5) Attempt to prevent 6) Be a disincentive to 7) Be an obstacle to 8) Become more profound 9) Block 10) Block or dissuade 11) Block the path of 12) Cause to have second thoughts 13) Cause to quail or retreat 14) Cause to think twice 1) Avert 2) Discourage 3) Dissuade 4) Foil 5) Repel 
• (v. t.) To prevent by fear; hence, to hinder or prevent from action by fear of consequences, or difficulty, risk, etc.
De·ter' transitive verb [ imperfect & past participle Deterred ; present participle & verbal noun Deterring .] [ Latin deterrere ; de + terrere to frighten, terrify. See Terror .] To prevent by fear; hence, ...
discourage hinder 
[v] - try to prevent
to discourage or restrain from acting or proceeding: The large dog deterred trespassers. · to prevent; check; arrest: timber treated with creosote to deter rot.
[SAT terms] turn away from by persuasion try to prevent; show opposition to