The answer is slapdash
The opposite would be sudden or abrupt, so the adjective could be hurried or instant.
A four letter word meaning not kosher is: tref
What is a nine letter word meaning very tidy
The word pine can have that meaning.
The answer is slapdash
Hustled or bustled.
a stupid or careless mistake
hurried
litterbugs
The root word "care" combined with the suffix "-less" creates the word "careless," meaning without care or consideration.
Careless and reckless are synonyms for irresponsible. Immature is another synonym.
careless or carelessly; impulsive; mechanical
The word meaning in a lax or careless manner is spelled "lackadaisical".
With the word meaning "primary or most important": This is the chief cause of the incident. With the word meaning "the head of a department": The chief of police hurried with the officers to the scene.
Untidy or haphazard, careless vs. careful. messy
I hurried my responses to finish the test within the time limits. The patrol hurried and harried the fleeing attackers. It was obvious the response was hurried.