ADJ.
erect
VERB + INTENTIVE
lent, sense
ADV.
suddenly
adj
Paying attention; attentive, heedful.
the object is fine and accurate , it conduceth much to have the sense intentive and erect
Intent (of the mind, thoughts etc.).
To which whilest she lent her intentive mind, / He suddenly his net upon her threw […]
Expressing intent.