relaxed

adjectives

without strain or anxiety
"gave the impression of being quite relaxed"; "a relaxed and informal discussion"
antonym
is similar to
free and relaxed in manner
"rather degage after the nervousness he had shown at dinner"- Edmund Wilson
is similar to
unhurried and relaxed
"a mellow conversation"
is similar to
not placed under psychological stress
"the campaign would not leave party loyalties unstrained"
see also
not agitated or disturbed emotionally
see also
free from worry or anxiety
"knowing that I had done my best, my mind was easy"; "an easy good-natured manner"; "by the time the chsild faced the actual problem of reading she was familiar and at ease with all the elements words"