assiduously
/əˈsɪdjʊəsli
/adverb
With great care and perseverance: leaders worked assiduously to hammer out an action plan...
- He was taught privately, his father assiduously fostering his musical talents.
- Even a book he assiduously promoted on prehistoric archaeology sold in hundreds of thousands.
- He assiduously avoided addressing the question of a merger.