incisive
US /ɪnˈsaɪ.sɪv/
UK /ɪnˈsaɪ.sɪv/

1.
intelligently analytical and clear-thinking
:
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Her incisive comments cut through the confusion.
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The report provided an incisive analysis of the economic situation.
2.
(of a person or mental process) able to analyze and think clearly
:
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She has an incisive mind.
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His incisive intellect allowed him to grasp complex concepts quickly.