motionless◼◼◼(at rest, not moving) adjective [UK: ˈməʊʃn.ləs] [US: ˈmoʊʃn.ləs]The sentries were standing bolt upright and motionless. = Les sentinelles se tenaient droites comme des piquets et immobiles.
immobile◼◼◼(not mobile) adjective [UK: ɪ.ˈməʊ.baɪl] [US: ɪˈmo.ʊ.baɪl]John is immobile. = John est immobile.
still [stiller, stillest]◼◻◻(not moving, calm) adjective [UK: stɪl] [US: ˈstɪl]