Sentence:  The wife , Amra , and her lover are both savagely portrayed , she as incarnate sensuality , `` voluptuous '' and `` indolent '' , possibly `` a mischief maker '' , with `` a kind of luxurious cunning '' to set against her apparent simplicity , her `` bird like <WSD>brain</WSD> '' . 
Meaning of the word marked with <WSD> tags:  mental ability