incisive

Etymology

It is borrowed from Medieval Latin incīsīvus,^{[2][3][4][5][6]} from Latin incīsus, the past participle of incīdō (“to cut into”),^[7][3][6] with the suffix -īvus.^[5] Etymonline records a form inscisif and also takes it from Old French incisif (“invasive, effective, as a medical term”),^[7] and the OED compares the French adjective, recorded in the 13th and 14th centuries.^[2] The Latin verb is formed from in- (“into”) and caedō (“to cut”), which Etymonline derives from Proto-Indo-European *kae-id- (“to strike”).^[7]

Earliest recorded meaning

Slashing, cutting with a sharp edge: early 15th century in Etymonline, as inscisif.^[7] The Shorter Oxford and the Oxford Dictionary of English also put the word in late Middle English,^[4][6] whereas the OED's first quotation is of 1528, from Paynell's translation of Arnaldus de Villa Nova, for the sense "sharp or keen in physical effect", and Dictionary.com dates it 1520–30.^[2][8]

Semantic evolution

The word began as a literal and medical one: old medicine and physiology called a drug incisive when it "cut" or loosened viscid humours, a use that ran from 1528 to 1694,^[2] and Johnson (1755) knew only "having the quality of cutting or dividing", with a quotation from Boyle about "very piercing and incisive liquors".^[9] The anatomical use, for the incisor teeth and the parts connected with them, came in 1804, after French dents incisives.^[2] The figurative sense of a mind or style that is sharp and clear is recorded only from around 1850, and Etymonline considers it a borrowing from French.^[2][7] It is now the only sense the American Heritage Dictionary gives,^[10] and Collins adds a biting, sarcastic shade.^[11]

Timeline

• early 15th century – inscisif, slashing, cutting with a sharp edge.^[7]
• 1528 – sharp or keen in physical effect; in medicine, loosening viscid humours (obsolete by 1694).^[2]
• 1598 – cutting, penetrating with a sharp edge, in a translation of Guillemeau's surgery.^[2][5] The 1989 edition of the OED has 1597.^[12]
• 1726 – noun, an incisive drug (obsolete).^[2]
• 1804 – of or relating to the incisor teeth; noun, an incisor tooth.^[2]
• before 1850 – of the mind or style, sharp, penetrating, trenchant, in M. F. Ossoli.^[2][7]

Meanings

Adjective

1. Sharp and clear in thought or expression; penetrating, trenchant: an incisive review of the budget.^{[10][11][5][2]}
2. Biting or sarcastic: an incisive reply.^[11][8]
3. Having a sharp cutting edge or point; suited to cutting.^[11][5][2]
4. (anatomy) Of or relating to the incisor teeth.^[2]
5. (obsolete, 1528–1694) Of a medicine, loosening viscid humours.^[2][4]

Noun

1. (anatomy) An incisor tooth.^[2]

Word family

• incisively
• incisiveness
• unincisive

Related words

• incise
• incision
• incisor

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o p Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
4. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ a b c Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
7. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
8. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
9. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
10. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
11. ^ a b c d Collins English Dictionary (2023), Glasgow: HarperCollins
12. ^ Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press