INERTIA Scrabble 7 Words With Friends 8 Definition noun a disposition to remain inactive or inert. — synonyms: inactiveness, inactivity noun (physics) the tendency of a body to maintain its state of rest or uniform motion unless acted upon by an external force. See all 91 words you can make from INERTIA → 7-letter words Words starting with I Words ending with A ← Unscramble different letters