プログレッシブ和英中辞典(第4版)の解説
いちず【一▲途】
一途な 〔真剣な〕earnest, serious；〔ひたむきな〕single-minded
一途に 〔真剣に〕with all one's heart, wholeheartedly；〔盲目的に〕blindly
一途な願い
an earnest prayer [wish]
彼女の一途な情熱には彼もたじたじだ
He can hardly resist her single-minded passion for him.
彼は一途に研究に打ち込んでいる
He is completely absorbed in his research.／He is intent upon [on] his studies.
彼女は彼が悪いのだと一途に思い込んでいる
「She is obsessed with the idea [She firmly believes] that he is to blame.
いっと【一途】
彼には辞職の一途あるのみだ
The only way open to him is to resign.
人口は増加の一途をたどっている
The population is steadily increasing.