unperturbed
adjective
[ ʌnpəˈtəːbd ]
• not perturbed or concerned.
• "Kenneth seems unperturbed by the news"
Similar:
untroubled,
undisturbed,
unworried,
unconcerned,
unmoved,
unflustered,
unruffled,
unshaken,
undismayed,
calm,
composed,
cool,
collected,
controlled,
unemotional,
serene,
tranquil,
self-possessed,
self-assured,
poised,
level-headed,
at ease,
placid,
and collected,
unflappable,
unflinching,
as cool as a cucumber,
unfazed,
laid-back,
together,
nonplussed,
