Thesaurus.com
Dictionary.com
Showing results for conscientious. Search instead for conscientio.
Definitions

conscientious

[kon-shee-en-shuhs, kon-see-] / ˌkɒn ʃiˈɛn ʃəs, ˌkɒn si- /
ADJECTIVE
thorough, careful
Synonyms
STRONGEST
diligent fastidious fussy meticulous painstaking
WEAK
complete exact exacting faithful hanging in hanging tough heart and soul into heedful minding p's and q's particular playing safe punctilious punctual reliable tough walking on eggs
Antonyms
STRONGEST
careless indifferent uncritical undemanding
WEAK
corrupt dishonest inexact irresponsible uncareful unconscientious unjust unscrupulous vulgar
ADJECTIVE
moral, upright
Synonyms
STRONGEST
honest honorable principled responsible scrupulous strict
WEAK
conscionable high-minded high-principled incorruptible just pious right straightforward true
Antonyms
STRONGEST
untrustworthy
WEAK
careless corrupt dishonest immoral inexact irresponsible uncareful unconscientious unjust unscrupulous vulgar

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Still, that will depend on lawmakers, regulators, and conscientious customers opposing this with all they’ve got, and soon.

From Slate • Feb. 27, 2026

"You have to be mindful and conscientious," she said, noting that last year's hosting gig in the shadow of deadly fires that devastated Los Angeles was a case in point.

From Barron's • Feb. 23, 2026

He declared himself a conscientious objector during World War II. He was imprisoned, abandoned by his family and returned to Birmingham only to be further ostracized.

From The Wall Street Journal • Feb. 19, 2026

Rhondda Cynon Taf council said it was "important to find the right balance between deterring what is blatant and reckless vandalism of this beautiful landscape, with the enjoyment of the thousands of conscientious visitors".

From BBC • Jan. 20, 2026

Dedicated, absorbed, and conscientious, she was soon promoted and began part-time studies at the Aviation Institute in Leningrad.

From "A Thousand Sisters" by Elizabeth Wein