haphazard (adj.)

"characterized by randomness, chance, accidental," 1670s, from noun meaning "a chance, accident" (1570s), from hap (n.) "chance, luck" + hazard (n.) "risk, danger, peril." Related: Haphazardly.

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Definitions of haphazard from WordNet
haphazard (adj.)
dependent upon or characterized by chance;
a haphazard plan of action
Synonyms: hit-or-miss
haphazard (adj.)
marked by great carelessness;
a most haphazard system of record keeping
Synonyms: slapdash / slipshod / sloppy
haphazard (adv.)
without care; in a slapdash manner;
the Prime Minister was wearing a grey suit and a white shirt with a soft collar, but his neck had become thinner and the collar stood away from it as if it had been bought haphazard
Synonyms: haphazardly