かたくなに の訳語→ adamantly pious robustly staunchly stoutly stubbornly tihgtly
ひたすら の訳語→ all anxiously avidly eagerly earnest earnestly intently just literally stolidly undeviatingly unflagging
頑なに の訳語→ adamant passionately
執拗に の訳語→ consistently determined dog-like endlessly insistent obstinately persistent relentlessly steadily tenaciously