Vine's Expository Dictionary: View Entry
The KJV translates Strong's G5156 in the following manner: trembling (4x), tremble (with G2192) (1x).
a trembling or quaking with fear
with fear and trembling, used to describe the anxiety of one who distrusts his ability completely to meet all requirements, but religiously does his utmost to fulfil his duty
Strong's Number G5156 matches the Greek τρόμος (tromos),
which occurs 5 times in 5 verses
in the TR Greek.