serendipitous, coincidental, providential, unfortunate, bizarre, odd, felicitous, propitious, peculiar, improbable, calamitous, strange, surprising, unlucky, fluky, unusual, ironic, remarkable, disastrous, puzzling, flukey, unexpected, inexplicable, freakish, miraculous, inauspicious, noteworthy, unpropitious, momentous, dicey, debatable, fortunate, galling, auspicious, lucky, baffling, untypical, synchronistic, misfortunate, awkward, advantageous, untimely, brilliant, dubious, dreadful, mystifying, unpromising, curious, implausible, favorable, intriguing, bewildering, disconcerting, unseemly, problematical, tricky, perplexing, eventful, stunning, unpredicted, prescient, unsurprising, splendid, inevitable, innocuous, interesting, dispiriting, clever, audacious, delightful, enterprising, tenuous, troubling, counterintuitive, precarious, unlikely, startling, marvelous, problematic, inopportune, fleeting, belated, embarrassing, dramatic, paradoxical, canny, notable, fateful, extraordinary, astonishing, rare, lamentable, nervy, uncharacteristic, opportune, ingenious, fated, unsettling, plausible, poetic justice, memorable, uncanny, unforeseeable, accidental, untoward, unforeseen, unforseen, regrettable, disturbing, unexplainable

causeless, uncaused, unintended