Definition of stability, Merriam-Webster Dictionary, The quality, state, or degree of being stable: such as “the strength to stand or endure, firmness”. Unstable: not stable; not firm or fixed; not constant; wavering in purpose or intent; vacillating. James 1:5-8 says, That man should not think he will receive anything from the Lord; he is a double-minded man, unstable in all he does.