restraint
US /rɪˈstreɪnt/
UK /rɪˈstreɪnt/

1.
a measure or condition that keeps someone or something under control or within limits
:
•
The police used physical restraint to subdue the suspect.
•
The government imposed strict financial restraints on spending.
2.
unemotional, dispassionate, or moderate behavior; self-control
:
•
She showed remarkable restraint despite the provocation.
•
The artist used great restraint in his use of color.