形容詞 a.p.t.:

1. at risk of or subject to experiencing something usually unpleasant
   同義詞：apt, liable
2. mentally quick and resourceful-Bram Stoker
   同義詞：apt, clever
3. (usually followed by `to') naturally disposed toward
   同義詞：apt, disposed, given, minded, tending
4. being of striking appropriateness and pertinence
   同義詞：apposite, appropriate, apt, pertinent