/ ɪnˈsaɪsɪv; NAmE / adjective ( approving )
1.
showing clear thought and good understanding of what is important, and the ability to express this :
incisive comments / criticism / analysis
an incisive mind
2.
showing sb's ability to take decisions and act with force :
an incisive performance
► in·ci·sive·ly adverb
► in·ci·sive·ness noun [ U ]
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WORD ORIGIN
late Middle English (in the sense cutting, penetrating): from medieval Latin incisivus , from Latin incidere cut into, from in- into + caedere to cut.