fluky

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, profitable

coincidental

freak, odd

aimless, arbitrary, desultory, haphazard, random

uncertain, unexpected, unforeseeable, unforeseen

coerced, forced, involuntary

unconscious, unprompted