Showing great care, attention, and effort in one’s work or duties.


US English

UK English

Part of Speech



Diligent, hardworking, industrious, conscientious, meticulous, thorough, painstaking, attentive, careful, persistent.


Lazy, idle, negligent, careless, haphazard, lackadaisical, inattentive, indifferent.

Word Forms

Part of Speech Words
Noun assiduousness, assiduousnesses, assiduity, assiduities
Verb None
Adjective assiduous
Adverb assiduously

Example Sentences

  • She was known for her assiduous attention to detail, and her work was always meticulous.

  • He was an assiduous student, studying late into the night to ensure he did well on his exams.

  • The team was able to complete the project on time thanks to their assiduous efforts.

  • The company’s success was due in large part to the assiduous efforts of its employees.


The word “assiduous” is an adjective that describes someone who is diligent, hardworking, and attentive to their work or duties. It can be used to describe someone who is careful and meticulous in their work, or someone who is persistent in their efforts to achieve a goal. The word has its roots in the Latin word “assiduus,” which means “constantly present” or “unceasing.”

The word “assiduous” is often used to describe a person’s work ethic or habits. For example, an assiduous student is someone who is dedicated to their studies and puts in a lot of effort to succeed. An assiduous employee is someone who is diligent and conscientious in their work, taking care to complete tasks to the best of their ability.

The word “assiduous” can also be used to describe a particular activity or process. For example, an assiduous cleaning routine would involve regularly cleaning and maintaining a space to keep it in top condition. An assiduous exercise routine would involve consistently and diligently following a workout plan to achieve fitness goals.

There are related words that use prefixes or suffixes to modify the meaning of “assiduous.” For example, “unassiduous” uses the prefix “un-” (meaning “not”) to describe someone who is not assiduous, or someone who is lazy or careless in their work. “Assiduity” is a related noun that describes the quality or state of being assiduous.