halcyon

1 free from storms or physical disturbance <a halcyon era following the American Civil War> Synonyms calm, hushed, lown [dialect], peaceful, placid, quiet, serene, still, stilly, tranquil, untroubledRelated Words balmy, clement, equable, gentle, mild, moderate, temperate; clear, cloudless, fair, rainless, sunny, sunshiny, windlessNear Antonyms blizzardy (also blizzardly), blustery, squally, windy; extreme, foul, intemperate, nasty, severeAntonyms agitated, angry, inclement, restless, rough, stormy, tempestuous, turbulent, unquiet, unsettled

2 marked by vigorous growth and well-being especially economically <during those early halcyon years the company's potential for growth seemed unlimited> Synonyms booming, boomy, flourishing, golden, prosperous, healthy, lush, palmy, prospering, roaring, successful, thrivingRelated Words affluent, moneyed (also monied), opulent, rich, substantial, wealthy, well-heeled, well-off, well-to-do; comfortableNear Antonyms declining, dying, failing, floundering, languishing, struggling; bankrupt, bankrupted, insolventAntonyms depressed, unprosperous, unsuccessful