inertia

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inertia

  • /ɪnˈɜː.ʃə/ Australia, UK
  • /ɪˈnɜː.ʃə/ Australia, UK
  • /ɪnˈɝ.ʃə/ US
  • /ɪˈnɝ.ʃə/ US

Rhymes with -ɜː(ɹ)ʃə

Where it comes from

From Latin inertia (“lack of art or skill, inactivity, indolence”), from iners (“unskilled, inactive”), from in- (“without, not”) + ars (“skill, art”). Something close to the modern physics sense was first used in New Latin by Johannes Kepler.

noun inertias · inertiae · inertiæ

  1. countable, uncountable The property of a body that resists any change to its uniform motion; equivalent to its mass.
  2. countable, figuratively, uncountable In a person, unwillingness to take action. Men […] have immense irresolution and inertia.

    Similar: idleness, laziness, sloth, slothfulness

  3. countable, uncountable Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased.

Thesaurus

Closest in meaning: inactivity, inactiveness, momentum, gridlock, paralysis, deadlock, slowness, laxity, slackness, tardiness, standstill, sluggishness, impasse, torpor, inflexibility, lethargy

Translations

Every language

noun in physics

Españolinercia
日本語慣性 kansei
中文慣性 /惯性 guànxìng
हिन्दीअक्रियता akriytā
Portuguêsinércia
Françaisinertie
DeutschTrägheit, Beharrungsvermögen, Beharrung
Italianoinerzia
Ελληνικάαδράνεια adráneia
Românăinerție
Русскийине́рция inɛ́rcija
Tiếng Việtquán tính
العربيةعَطَالَة ʕaṭāla

noun unwillingness to take action

Españolinercia
日本語惰性 dasei
हिन्दीनिष्क्रियता niṣkriytā
Portuguêsinércia
DeutschTrägheit, Schwerfälligkeit, Unbeweglichkeit
Italianoinerzia
Русскийине́ртность inɛ́rtnostʹ, вя́лость vjálostʹ
العربيةعَطَالَة ʕaṭāla

noun in medicine

DeutschReglosigkeit, Schwerfälligkeit, Trägheit

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Cite this
MLA

"inertia." Wiktionary, via Micwyn, micwyn.com/word/inertia. Accessed 6 Nov. 2026.

APA

inertia. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/inertia

Chicago

"inertia." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/inertia.

BibTeX
@misc{inertia_2026,
  title = {inertia},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/inertia},
  urldate = {2026-11-06}
}