slapdash

adjective
1

Produced or carried out hastily; haphazard; careless.

adverb
1

In a hasty or careless manner.

2

Directly, right there; slap-bang.

"Van Eyck signed his portrait of the Arnolfinis slapdash in the center of the painting."

3

With a slap; all at once; slap.

verb
1

To apply, or apply something to, in a hasty, careless, or rough manner; to roughcast.

"to slapdash mortar or paint on a wall"

Source: https://en.wiktionary.org/wiki/slapdash

Definitions come from the Free Dictionary API (dictionaryapi.dev), with Wiktionary as a fallback when it is slow, and are cached for up to 24 hours.