penetrative vs knifelike

penetrative and knifelike both are adjectives.

Word	Noun	Adjective	Verb	Adverb
penetrative	No	Yes	No	No
knifelike	No	Yes	No	No

As adjectives, penetrative and knifelike are synonyms defined as:

penetrative and knifelike: having or demonstrating ability to recognize or draw fine distinctions

Other synonyms of penetrative include acute, discriminating, incisive, keen, penetrating, piercing, sharp.

penetrative (adjective)	knifelike (adjective)
having or demonstrating ability to recognize or draw fine distinctions	having a sharp or distinct edge
tending to penetrate; having the power of entering or piercing	having or demonstrating ability to recognize or draw fine distinctions
	cutting or able to cut as if with a knife
	painful as if caused by a sharp instrument