fortuitous

1 coming or happening by good luck especially unexpectedly your arrival just before the thunderstorm was fortuitous Synonyms fluky (also flukey), fortunate, happy, heaven-sent, lucky, providentialRelated Words convenient, opportune, seasonable, timely; unexpected, unforeseen, unlooked-for; accidental, chance, coincidental, serendipitous; auspicious, bright, encouraging, fair, heartening, hopeful, promising, propitious; benign, favorable, golden, good, halcyon; advantageous, beneficial, profitableNear Antonyms inconvenient, inopportune, unseasonable, untimely; anticipated, expected, foreseen; deliberate, intentional, planned; inauspicious, unpromising; calamitous, catastrophic, disastrousAntonyms hapless, ill-fated, ill-starred, luckless, star-crossed, unfortunate, unhappy, unlucky

2 happening by chance firmly believes that the creation of the universe was something other than just the fortuitous coming together of particles of matter Synonyms casual, chance, fluky (also flukey), accidental, inadvertent, incidental, unintended, unintentional, unplanned, unpremeditated, unwittingRelated Words coincidental; freak, odd; aimless, arbitrary, desultory, haphazard, random; uncertain, unexpected, unforeseeable, unforeseen; coerced, forced, involuntary; unconscious, unpromptedNear Antonyms certain, destined, expected, fixed, foreordained, foreseeable, foreseen, inevitable, predestined, predetermined, predictable, preordained, prescribed, sure; conscious, freewill, knowing, unforced, voluntary, volunteer, willful (or wilful)Antonyms calculated, deliberate, intended, intentional, planned, premeditated, premeditative, prepense, set