assiduous

showing great care, effort, and persistence in doing something

Examples

Emma was assiduous in her research, checking every source twice.
Through assiduous practice, Leo finally mastered the piano piece.
The assistant kept an assiduous record of every meeting.

All Words

ephemeral
Lasting for a very short time; fleeting or transitory.
resilient
Able to recover quickly from difficulties, setbacks, or changes; flexible and strong.
perfunctory
Done merely as a duty or routine, without genuine interest, effort, or enthusiasm.

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