I've tagged this one ABUNAI, because it's often used ironically - more like 'bitch'. 
To make things even more complicated, the rude version is often written as '阿魔' rather than 尼, I guess to not be blasphemous.  Even though the origin of the word is 尼!  But who cares - chances are you'll mostly encounter the rude version in conversation anyway ('このあま!' or ’このあまっこ!’). So forget I said anything about 阿魔. . . 
Onyomi
Mnemonic
|  | It's the corpse of a nun who got poisoned-darted in the heel, all Achilles style. Weird. | 
Kunyomi
| あま
(
さん
) | Buddhist nun
ABU ★☆☆☆☆
 | 
Lookalikes
|  | Meaning | Hint | Radical | 
| 尼 | nun | HEEL |  | 
| 泥 | mud | WET | 水 | 
| 尻 | butt | NINE | 九 | 
Nuns wear high-HEELS under their gowns.
The heels get WET from the MUD.
To beat a baseball team, you must kick NINE butts!
Used In