"The low Posthumus, she slanders so her judgement."
Sc. 6.
"When resty Sloth
Finds the down-pillow hard."
Singer quotes Bullokar's Expositor to show that 'resty' is idle, inert. Steevens proposed restive.
"Since Leonatus' false."
That is 'Since Leonatus is,' to avoid cacophony.