rtl-support.css

#rtl-support .tt-dropdown-menu {
  text-align: right;
}

rtl-support.html

<div id="rtl-support">
  <input class="typeahead" type="text" dir="rtl" placeholder="نعم">
</div>

rtl-support.js

var arabicPhrases = new Bloodhound({
  datumTokenizer: Bloodhound.tokenizers.obj.whitespace('word'),
  queryTokenizer: Bloodhound.tokenizers.whitespace,
  local: [
    { word: "الإنجليزية" },
    { word: "نعم" },
    { word: "لا" },
    { word: "مرحبا" },
    { word: "کریم" },
    { word: "رحیم" },
    { word: "رحمن" },
    { word: "عامل" },
    { word: "حمید" },
    { word: "محمد" },
    { word: "سعید" },
    { word: "خالق" },
    { word: "ضیغ" },
    { word: "صیدلیه" },
    { word: "ثم" },
    { word: "قیام" },
    { word: "فیلم" },
    { word: "غیر" },
    { word: "هیاهو" },
    { word: "دست" },
    { word: "أهلا" }
  ]
});

arabicPhrases.initialize();

$('#rtl-support .typeahead').typeahead({
  hint: false
},
{
  name: 'arabic-phrases',
  displayKey: 'word',
  source: arabicPhrases.ttAdapter()
});
});