本篇文章探討魯凱語霧台方言（好茶村變體）疑問詞的極性用法。我們發現，在特定的構詞或句法環境中，魯凱語的疑問詞能夠作為極性詞項並當作無定詞來使用。這些環境可歸結為兩類，一類具有顯著的構詞或句法標記，而這些標記能夠認可疑問詞以作為無定詞。另一類則無類似標記，於此環境中出現的無定用法可歸因於疑問詞項本身的獨特屬性。總括來說，本文之援例說明了魯凱語疑問詞的無定用法表現在句法、構詞以及詞組三個層面，此現象符合蔡維天教授（1997a, 1997b）對其他台灣南島語所提出的類型分析。

In this paper we examine polarity licensing of the interrogatives in Budai Rukai (Kucapungan variety). It is shown that in certain morphosyntactic environments interrogatives are licensed as polarity items and are interpreted as indefinites. We specifically investigate two types of polarity licensing, the first with overt triggers and the second without overt triggers. By providing typological analyses along the line of Tsai (1997a, 1997b), our examination of syntactic and morphological properties concludes that Rukai exhibits characteristics of polarity licensing at the syntactic, morphological and phrasal levels.