Adjective

(en adjective)

Quickly proceeding to judgment and forceful in expression; decisive; forthright.

* {{quote-book, year=1922, author=(Ben Travers), title=(A Cuckoo in the Nest)

, chapter=1 citation , passage=She was like a Beardsley Salome , he had said. And indeed she had the narrow eyes and the high cheekbone of that creature, and as nearly the sinuosity as is compatible with human symmetry. His wooing had been brief but incisive .}}

Intelligently analytical and concise.

Having the quality of incising, cutting, or penetrating, as with a sharp instrument; sharp; acute; sarcastic; biting.

* G. Eliot

An incisive , high voice.

* Mrs. Browning

And her incisive smile accrediting / That treason of false witness in my blush.

(anatomy) Of or relating to the incisors.

Adjective

(er)

quickly and critically discerning

shrewd or crafty

* 2014 , A teacher, " Choosing a primary school: a teacher's guide for parents", The Guardian , 23 September 2014:

The best headteachers are like submarine captains – cool-headed, astute decision-makers – who trust their colleagues and surroundings to indicate where their ship is headed.