Antonyms of adj slapdash

1 sense of slapdash

Sense 1
haphazard, slapdash, slipshod, sloppy -- (marked by great carelessness; "a most haphazard system of record keeping"; "slapdash work"; "slipshod spelling"; "sloppy workmanship")

INDIRECT (VIA careless) -> careful -- (exercising caution or showing care or attention; "they were careful when crossing the busy street"; "be careful to keep her shoes clean"; "did very careful research"; "careful art restorers"; "careful of the rights of others"; "careful about one's behavior")

Similarity of adj slapdash

1 sense of slapdash

Sense 1
haphazard, slapdash, slipshod, sloppy -- (marked by great carelessness; "a most haphazard system of record keeping"; "slapdash work"; "slipshod spelling"; "sloppy workmanship")
       => careless (vs. careful) -- (marked by lack of attention or consideration or forethought or thoroughness; not careful; "careless about her clothes"; "forgotten by some careless person"; "a careless housekeeper"; "careless proofreading"; "it was a careless mistake"; "hurt by a careless remark")

Synonyms of adv slapdash

2 senses of slapdash

Sense 1
slapdash, slam-bang -- (in a careless or reckless manner; "the shelves were put up slapdash")

Sense 2
bang, slap, slapdash, smack, bolt -- (directly; "he ran bang into the pole"; "ran slap into her")