Incisive (9)

'incisive' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for trenchant that I've seen before include "caustic?" , "blunt" , "Forceful" , "Sharp" , "Acerbic" .)
'incisive' is the definition.
(I know that incisive can be written as sharp)
This is all the clue.
(Other definitions for sharp that I've seen before include "Bitter" , "Hurtful" , "Acidic; note" , "Fly - biting" , "Unscrupulous character" .)
'incisive' is the definition.
(I know that incisive can be written as penetrating)
This is all the clue.
(Other definitions for penetrating that I've seen before include "Going through" , "Acute" , "Incisive" , "Boring - keen" .)