In a random, unplanned, or disorganized manner; without any system or order.
From 'haphazard' (itself from 'hap' + 'hazard'), literally 'luck-danger,' with the adverbial suffix -ly added to form the adverb meaning 'in a haphazard manner.'
The word 'haphazard' is wonderfully self-aware—it combines 'hap' (luck) with 'hazard' (danger) to capture that feeling of chaos, like luck and danger are inevitably mixed together.
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