Antonyms of adj scrupulous

2 senses of scrupulous

Sense 1
scrupulous (vs. unscrupulous) -- (having scruples; arising from a sense of right and wrong; principled; "less scrupulous producers sent bundles that were deceptive in appearance")

unscrupulous (vs. scrupulous) -- (without scruples or principles; "unscrupulous politicos who would be happy to sell...their country in order to gain power")

Sense 2
conscientious, painstaking, scrupulous -- (characterized by extreme care and great effort; "conscientious application to the work at hand"; "painstaking research"; "scrupulous attention to details")

INDIRECT (VIA careful) -> careless -- (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")

Similarity of adj scrupulous

2 senses of scrupulous

Sense 1
scrupulous (vs. unscrupulous) -- (having scruples; arising from a sense of right and wrong; principled; "less scrupulous producers sent bundles that were deceptive in appearance")
       => religious -- (extremely scrupulous and conscientious; "religious in observing the rules of health")
          Also See-> principled#1

Sense 2
conscientious, painstaking, scrupulous -- (characterized by extreme care and great effort; "conscientious application to the work at hand"; "painstaking research"; "scrupulous attention to details")
       => careful (vs. careless) -- (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")