Unstable, Unsteadfast - Vine's Expository Dictionary of New Testament Words
Unstable, Unsteadfast
[ 1,,G793, asteriktos ]a, negative, sterizo, to fix," is used in 2 Peter 2:14; 2 Peter 3:16, AV, "unstable," RV, "unsteadfast."
[ 2,,G182, akatastatos ]
from kathistemi, "to set in order," is rendered "unstable" in James 1:8, See RESTLESS.