Incisivity

The remarkable tenor qualities of De Muro, especially in the ardent incisivity of his high register, the manly warmth of his tone and his exceptional breathing (Fiato), as well as his uncommon qualities of interpretation, capable of violent dramatic impulse and of lyric inflexion, remain documented in the excerpts he recorded of “Isabeau” in 1912, a testimony, at least auditive, of what was his legendary Folco.

Source: wiktionary

A true witness of his times and the men that have lived in them, [Al. Rosetti] has sketched with a firm hand unforgettable portraits of an illustrious series of friends, in a ‘White Book[’], and has never disclosed the virulent pages in which he describes human larvae with the incisivity of steel engravings for a possible Black Book.

Source: wiktionary

[T]hey pertain mainly to the anthropological perspective, to the specific language it uses and, last but not least, to a lack of courage and incisivity.

Source: wiktionary

The humorous writer caught not only the sound of dialogues and words, but also their human substance, the circumstance in which they were uttered, and afterwards, recasting everything, [I. L. Caragiale] produced, out of his inexhaustible retort, highly vivid, authentic types, either moulded with kindness or drawn with incisivity. […] [T]o promote society by purging it of its vices[: t]o this end [comedy writers] make good use of the incisivity of the satire.

Source: wiktionary