Etymology

intense

in·tense
I1N1T1E1N1S1E1

Today it means: Of a characteristic: extreme or very high or strong in degree; severe; also, excessive, towering. Full definition →

Middle English intens ← Old French intense ← Latin intēnsus
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The story

  1. Proto-Indo-European · derived from*tend-“to extend, stretch”
  2. Latin · derived fromintēnsus“strained, stretched tight; intense; attentive; violent; (rare) eager, intent”
  3. Old French · derived fromintense
  4. Middle English · inherited fromintens
  5. English todayintense

From Late Middle English intens, intense (“ardent, fervent; extreme, great, intense”), borrowed from Old French intense (modern French intense), or directly from its etymon Latin intēnsus (“strained, stretched tight; intense; attentive; violent; (rare) eager, intent”), the perfect passive participle of intendō (“to stretch out, strain”), from in- (prefix meaning ‘in, inside, within’) + tendō (“to extend, stretch”) (ultimately from Proto-Indo-European *tend- (“to extend, stretch”)).

Words from the same roots

Latinintēnsus all →

Proto-Indo-European*tend- all →

intensiveportentousdétenteostent

Etymology from Wiktionary, CC BY-SA 4.0.