stock-still
adverb
[ stɒkˈstɪl ]
• without any movement; completely still.
• "he stood stock-still"
Similar:
motionless,
completely still,
unmoving,
without moving,
immobile,
without moving a muscle,
as if rooted to the spot,
like a statue,
as if turned to stone,
unstirring,
immobilized,
inert,
