Diligent, responsible, and thorough in one’s work or actions.


US English

UK English

Part of Speech



Careful, thorough, responsible, diligent, reliable


Careless, irresponsible, neglectful, sloppy, lazy

Word Forms

Part of Speech Words
Noun conscientiousness, consciences, conscience, conscientiousnesses
Verb None
Adjective conscientious
Adverb conscientiously

Example Sentences

  • As a conscientious student, Sarah always completed her assignments on time, double-checked her work for accuracy, and actively participated in class discussions.

  • The conscientious employee took pride in her work, ensuring that every task was carried out with meticulous attention to detail and a strong commitment to meeting deadlines.

  • The conscientious nurse diligently followed medical protocols, carefully documenting patient information, and consistently delivering compassionate care to those in need.

  • The conscientious doctor made sure to carefully review all the patient’s medical records before making a diagnosis.


The word “conscientious” is an adjective that describes someone who is diligent, thorough, and responsible in their actions and work. The word has its roots in the Latin word “conscientia,” which means “knowledge within oneself” or “moral sense.” The prefix “con-” means “with,” while the root word “scientia” means “knowledge” or “understanding.” Thus, someone who is conscientious is characterized by their strong sense of responsibility and their commitment to doing what is right.

The word “conscientious” is often used to describe someone who takes their work or responsibilities seriously and strives to do their best. A conscientious employee, for example, is someone who is diligent in their work and takes care to complete tasks thoroughly and accurately. A conscientious student, on the other hand, is someone who is diligent in their studies and puts in the effort to learn and understand the material.

One variation of the word “conscientious” is the adverb “conscientiously,” which means “in a thorough and responsible manner.” This word is often used to describe someone who is working diligently and putting in the effort to do their best. Another variation is the noun “conscientiousness,” which refers to the quality of being diligent, responsible, and thorough. Someone who is high in conscientiousness is likely to be reliable and trustworthy, and is often seen as a valuable asset in the workplace or in other areas of life.

Overall, the word “conscientious” and its variations emphasize the importance of responsibility, diligence, and doing what is right. These qualities can be valuable in many areas of life, from the workplace to personal relationships, and can help individuals to achieve their goals and make a positive impact in the world.