Etymology
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slapdash (adv.)

1670s, from slap (v.) + dash (v.). As an adjective, "dashing, offhand, careless," from 1792. As a noun, "rough-coat, coarse plaster," from 1796.

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Definitions of slapdash
1
slapdash (adv.)
in a careless or reckless manner;
the shelves were put up slapdash
Synonyms: slam-bang
slapdash (adv.)
directly;
Synonyms: bang / slap / smack / bolt
2
slapdash (adj.)
marked by great carelessness;
slapdash work
Synonyms: haphazard / slipshod / sloppy
From wordnet.princeton.edu