Adjective

• S: (adj) knifelike (cutting or able to cut as if with a knife)
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• antonym
• S: (adj) acute, discriminating, incisive, keen, knifelike, penetrating, penetrative, piercing, sharp (having or demonstrating ability to recognize or draw fine distinctions) "an acute observer of politics and politicians"; "incisive comments"; "icy knifelike reasoning"; "as sharp and incisive as the stroke of a fang"; "penetrating insight"; "frequent penetrative observations"
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• derivationally related form
• antonym
• S: (adj) cutting, keen, knifelike, piercing, stabbing, lancinate, lancinating (painful as if caused by a sharp instrument) "a cutting wind"; "keen winds"; "knifelike cold"; "piercing knifelike pains"; "piercing cold"; "piercing criticism"; "a stabbing pain"; "lancinating pain"
• S: (adj) knifelike (having a sharp or distinct edge) "a narrow knifelike profile"
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• W: (adj) indistinct [Indirect via distinct] (not clearly defined or easy to perceive or understand) "indistinct shapes in the gloom"; "an indistinct memory"; "only indistinct notions of what to do"