shakiness

the quality or state of not being firmly fixed in position we added a couple more ropes to help reduce the shakiness of the footbridge Synonyms insecurity, precariousness, instability, unstableness, unsteadinessRelated Words insubstantiality, unsoundness; changeability, inconstancy, mutability; laxness, looseness, slacknessNear Antonyms firmness, soundness, substantialityAntonyms fastness, fixedness, security, stability, steadiness