hal·cy·on

/ˈhalsēən/

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adjective

denoting a period of time in the past that was idyllically happy and peaceful.

"the halcyon days of the mid-1980s, when profits were soaring"

Similar:

serene

calm

pleasant

balmy

tranquil

peaceful

temperate

mild

quiet

gentle

placid

still

windless

stormless

happy

carefree

blissful

golden

joyful

joyous

contented

idyllic

palmy

flourishing

thriving

prosperous

successful

Opposite:

stormy

troubled

noun

1.

a tropical Asian and African kingfisher with brightly colored plumage.

2.

a mythical bird said by ancient writers to breed in a nest floating at sea at the winter solstice, charming the wind and waves into calm.