assiduous
uh-SIJ-oo-usadjMeaning giving steady, careful attention to a task without letting up
Memory hook AS-SID-uous: SITS BESIDE the task. Lin sits beside her thousand-piece puzzle hour after hour, fitting piece after piece, and never leaves her seat. Her work is assiduous.
Thanks to assiduous practice, Rosa finally played the whole piece without a single mistake.
In context The puppy learned to sit in a week, but only because of Dev’s assiduous training: ten short lessons a day, with a treat for every success.
Similar diligent, tireless, persevering, industrious
Opposite lazy, negligent, halfhearted
From Latin assiduus, from assidere, “to sit beside”: ad (near) + sedere (to sit). An assiduous worker stays seated at the task.