いいつのる (translations)→ argue demand insist
執拗な (translations)→ dogged patient persistent
執拗に (translations)→ consistently determined dog-like doggedly endlessly obstinately relentlessly steadily stubborn stubbornly tenaciously
はっきりと (translations)→ accurate actually articulately clear clearly completely crystal clear decisively deeply directly distinct distinctly emphatically exactly expressly fully precisely really steady unambiguous unequivocally unmistakable vividly
こだわる (translations)→ adhere attention be obsessed with care dwell fascination fuss obsess particular