inertia
UK /ɪnˈɜː.ʃə/ · US /ɪnˈɝ.ʃə/ noun
Forms inertias inertiae inertiæ
- noun (physics, uncountable or countable) The property of a body that resists any change to its uniform motion; equivalent to its mass.
- noun (figuratively) In a person, unwillingness to take action.
- noun (medicine) Lack of activity; sluggishness; said especially of the uterus, when, in labour, its contractions have nearly or wholly ceased.
Synonyms
idleness laziness sloth slothfulness inactiveness inactivity
Etymology
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.
Webster’s 1913
- noun That property of matter by which it tends when at rest to remain so, and when in motion to continue in motion, and in the same straight line or direction, unless acted on by some external force; - -sometimes called vis inertiæ.
- noun Inertness; indisposition to motion, exertion, or action; want of energy; sluggishness.
Etymology [L., idleness, fr. iners idle. See Inert.]
Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “inertia”, CC BY-SA 4.0. Details