Etymograph

English

pertinacious

Pertinacious comes from Latin pertinax, from tenax ‘tenacious’, and ultimately from Proto-Indo-European *ten- ‘to stretch, extend’.

  1. Proto-Indo-Europeanc. 4500–2500 BCE*ten-1‘to stretch, extend’reconstructed
  2. Proto-Indo-European, derivedc. 4500–2500 BCE*tn̥eh₁yéti1reconstructed
  3. Proto-Italicc. 1500–700 BCE*tenēō1‘to hold’reconstructed
  4. Latinc. 75 BCE–200 CEteneō1‘to hold, grasp’
  5. Latin, derivedc. 75 BCE–200 CEtenax2‘tenacious’
  6. Latin, derivedc. 75 BCE–200 CEpertinax2
  7. Old Frenchc. 842–1400pertinace2
  8. Englishearliest quotation 1678pertinacious2

attested reconstructed ? uncertain or disputed deepest recorded ancestor

  1. 1 Wiktionary, Latin tenax
  2. 2 Wiktionary, English pertinacious
  3. Earliest quotation in Wiktionary’s entry: 1678, Izaak Walton, The life of Dr. Sanderson: “[O]ne of the Dissenters, which I could, but forbear,…”.

Lineage

  1. Proto-Indo-Europeanc. 4500–2500 BCE*ten-Wiktionary, Latin tenax‘to stretch, extend’reconstructed
  2. Proto-Indo-European, derivedc. 4500–2500 BCE*tn̥eh₁yétiWiktionary, Latin tenaxreconstructed
  3. Proto-Italicc. 1500–700 BCE*tenēōWiktionary, Latin tenax‘to hold’reconstructed
  4. Latinc. 75 BCE–200 CEteneōWiktionary, Latin tenax‘to hold, grasp’
  5. Latin, derivedc. 75 BCE–200 CEtenaxWiktionary, English pertinacious‘tenacious’
  6. Latin, derivedc. 75 BCE–200 CEpertinaxWiktionary, English pertinacious
  7. Old Frenchc. 842–1400pertinaceWiktionary, English pertinacious
  8. Englishearliest quotation 1678pertinaciousWiktionary, English pertinacious. Earliest quotation in Wiktionary’s entry: 1678, Izaak Walton, The life of Dr. Sanderson: “[O]ne of the Dissenters, which I could, but forbear,…”

Formed from pertinace + -ious

Linked words

through Proto-Indo-European *ten- ‘to stretch, extend’

tone, tight, maintenance, ton, tune, entertainment, obtain, tender, tonic, tendon, pristine, tetanus, countenance, tantra, tendinitis, maintainer, retentive, hypotenuse, impertinent, 62 more

through Proto-Italic *tenēō ‘to hold’

container, incontinent, 18 more

through Latin teneō ‘to hold, grasp’

content, continue, contain, tennis, retain, continent, continuous, detention, sustain, tenant, retention, tenor, rein, continuum, detain, tenet, abstinence, abstain, tenement, sustenance, incontinence, retinue, pertain, abstention, tenable, continence, abstinent, 20 more

through Latin tenax ‘tenacious’

tenacity, tenacious, 2 more

Today it means

adj Holding tenaciously to an opinion or purpose.

Sources

Sources: Wiktionary, “pertinacious”; the older steps come from the Wiktionary entry for Latin tenax. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.

Etymograph / Proto-Indo-European *ten- / pertinacious

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