INERTIA

Definition:

1. [noun] a disposition to remain inactive or inert; "he had to overcome his inertia and get back to work"
   Synonyms: inactiveness, inactivity
   
   
2. [noun] (physics) the tendency of a body to maintain is state of rest or uniform motion unless acted upon by an external force
   
   

Synonyms:

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Related Words:

• languor, lethargy, sluggishness, phlegm
• restfulness
• passivity, passiveness
• indolence, laziness
• moment of inertia