constraint

command, control, mastery, possession

self-censorship, self-containment, self-denial, self-discipline, self-government, self-mastery, will, willpower

composure, self-poise, self-possession

aloofness, detachedness, distance

bashfulness, modesty, shyness

reticence, silence, taciturnity

exception, proviso, qualification, reservation, stipulation, strings

ban, prohibition, proscription

browbeating, bulldozing, bullying

fear, intimidation, menace, sword, terror, terrorism, threat, violence

squeeze, squeeze play

might, muscle, potency, puissance, strength

hardheadedness, self-will, willfulness

strain, stress