Antonyms of adj too-careful

1 sense of too-careful

Sense 1
overcareful, too-careful -- (excessively or unduly careful)

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 too-careful

1 sense of too-careful

Sense 1
overcareful, too-careful -- (excessively or unduly careful)
       => 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")