* Formal: "The student's assiduous efforts in studying paid off when she aced the exam."
* Informal: "My friend is assiduous about her fitness routine, working out every day without fail."
* Descriptive: "The gardener's assiduous care resulted in a flourishing flower bed."
* Figurative: "The detective's assiduous investigation uncovered a web of deceit."
Note: "Assiduous" implies persistent, diligent, and attentive work. It often has a positive connotation.