Strong's G186 — ἀκλινής (adjective)
aklines (ak-lee-nace') adj.
1. not leaning
2. (figuratively) firm
[from G1 (as a negative particle) and G2827]
KJV: without wavering 
Root(s): G1, G2827 
Hebrew root: κλίνω
Occurrences: 1