halcyon — OET

halcyon

adjective

1 hot, halcyon days of sunshine:

serene, calm, pleasant, balmy, tranquil, peaceful, temperate, mild, quiet, gentle, placid, still, windless, stormless.

▷antonyms stormy.

2 the halcyon days of the 1960s:

happy, carefree, blissful, golden, joyful, joyous, contented, idyllic, palmy;

flourishing, thriving, prosperous, successful.

▷antonyms troubled.

halcyon Oxford Dictionary of English