restraint

noun

• 1 (often restraints) a measure or condition that keeps someone or something under control:decisions are made within the financial restraints of the budget
• [mass noun] the action of keeping someone or something under control: a policy of restraint in public spending
• [mass noun] deprivation or restriction of personal liberty or freedom of movement:he remained aggressive and required physical restraint
• a device which limits or prevents freedom of movement:car safety restraints

• 2 [mass noun] unemotional, dispassionate, or moderate behaviour; self-control:he urged the protestors to exercise restraint
• understatement, especially of artistic expression:with strings and piano, all restraint vanished