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Definition of lucky : 1. Favored by luck; fortunate; meeting with good success or good fortune; - said of persons; as, a lucky adventurer.
2. Producing, or resulting in, good by chance, or unexpectedly; favorable; auspicious; fortunate; as, a lucky mistake; a lucky cast; a lucky hour.

Synonyms:

roaring, (it's) all right for someone, gilt, well-disposed, there but for the grace of God (go I), flourishing, luck, halcyon, well-off, well-situated, thank God/goodness/heaven(s), thriving, aureate, luck is on someone's side, prosperous, happy, charmed, gilded, friendly, apotropaic, golden, fortunately, easy, serendipitous, fortune smiles on someone/something, hot, prospering, lucky (old) you/me etc., gold, beginner's luck, lottery, well-heeled, comfortable, well-fixed, encouraging, hopeful, heaven-sent, favourable, dumb luck, providential, palmy, magic, prospered, booming, fortune, well-to-do, third time's the/a charm

fortuitous, fortunate, accidental, aimless, fatal, adventitious, fluky, chance, casual, purposeless, causeless, random, unintentional, haphazard

blessed, favorable, auspicious, advantageous, favored, successful, propitious

hit-or-miss, potluck, hazardous, coin toss, risky, uncertain, speculative

Usage examples:

• " You're lucky, then," replied Grigsby. - "Dave Darrin's First Year at Annapolis", H. Irving Hancock.
• I think she would be a lucky girl. - "A Venetian June", Anna Fuller.
• It's lucky I happened to meet you, isn't it? - "The Ragged Trousered Philanthropists", Robert Tressell.