What is a Synonym for careless?

Here are some synonyms for careless, depending on the specific nuance you want to convey:

General carelessness:

* Negligent

* Heedless

* Inattentive

* Reckless

* Thoughtless

* Unmindful

* Indiscreet

* Irresponsible

Carelessness leading to mistakes:

* Erratic

* Haphazard

* Sloppy

* Lax

* Flippant

Carelessness with consequences:

* Rash

* Imprudent

* Inconsiderate

* Unwary

Informal synonyms:

* Slipshod

* Lackadaisical

* Scatterbrained

The best synonym will depend on the specific context of your writing.