IPA: //ʌnˈstreɪnd//
KK: /ʌnˈstreɪnd/
Not under pressure or tension; relaxed and free from stress.
The unstrained atmosphere in the room made everyone feel comfortable and at ease.
Unstrained → It is formed from "un-" (meaning not) and "strained" (from Old French *estrain*, meaning to stretch or exert). The word "unstrained" means not stretched or exerted, indicating a relaxed or easy state.
Think of 'not' ('un-') being applied to something that is 'stretched' or 'exerted' ('strained'). This helps you remember that 'unstrained' refers to a state that is relaxed or easy.