unworried

Free from anxiety

Unworried means free from anxiety or concern, not troubled by a situation that might worry others.

Someone unworried about an upcoming exam either feels prepared or simply doesn't care about the outcome: She seemed completely unworried despite the deadline.

The word often implies a calm that others find surprising or enviable.

tranquil

serene

Untroubled and composed

still · quiet · restful · reposeful · halcyon · idyllic · soothing · gentle · untroubled · undisturbed

relaxed

laid-back

Calm and unhurried

loose · leisurely · unhurried · nonchalant · chill · comfortable · at-ease · slack · informal · unceremonious

calm

composed

Calm and self-possessed

levelheaded · self-possessed · steady · even-tempered · poised · centered · balanced · grounded · unflustered · unshaken

confident

assured

Certain or self-possessed

certain · positive · undaunted · unafraid · self-assured · trusting · hopeful · unfearful · bold · poised

carefree

lighthearted

Cheerful and without worry

insouciant · jaunty · breezy · sunny · cheerful · sprightly · frolicsome · playful · unburdened · footloose

Opposites
mental ease vs. anxiety

unworriedworried

Troubled by uncertainty

anxious · troubled · nervous · concerned · fearful

Family

worry, worried, worrying, worries, worrisome, worrywart, worrier, worriment

Familiarity
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Known to kids · Used worldwide · Timeless · Abstract · Positive · Everyday, not technical · Rated G