ひたすら

ひたすら 〖ただ 〗only ; 〖非常に 〗｟やや書 ｠solely ; 〖熱心に 〗earnestly ; 〖懸命に 〗very hard . （⇨一生懸命 ）▸ 彼はひたすらがん細胞の研究に打ち込んだ He devoted himself entirely [heart and soul ] to his research on cancer cells . (!heart and soul は文尾に置いてもよい ) ▸ 母は息子の無事をひたすら祈った The mother earnestly prayed for her son's safety .