IPA: /rɪˈstreɪndɪli/
KK: /rɪˈstreɪndɪdli/
In a way that shows self-control or moderation; not overly emotional or expressive.
She spoke restrainedly during the meeting, keeping her emotions in check.
Restrainedly → It is formed from "restrain" (from Latin "restringere", meaning to bind back) and "-ly" (a suffix used to form adverbs). The word "restrainedly" means in a manner that is held back or controlled.
Think of someone who is 'binding back' their emotions ('restringere') and acting in a controlled way — that's what it means to behave restrainedly.