n.

1. 簡單，簡易；簡明[U]
   The advantage of the idea was its simplicity.

   這個主意的優點就在於它簡單明瞭。

2. 簡明易懂的事物[P]
3. 簡樸，樸素[U]
   She dressed with elegant simplicity.

   她的穿著樸素而雅緻。

4. 純樸，單純[U]
5. 真誠，坦率[U]
6. 無知，愚蠢[U]
   His simplicity made him easily fooled.

   他的無知使他很容易受騙上當。

n.

1. the quality or condition of being simple.
2. a thing that is simple.