How to say "single-minded" in Japanese

• 一途いちずCommon
  na-adjective, noun, noun (suffix)Covers 'single-minded' as wholehearted, determined devotion—being set on one person or pursuit to the exclusion of all else. Typical of unwavering love or single-hearted dedication to a goal.
• 一筋ひとすじJLPT N1approx.Common
  na-adjective, noun (suffix)Covers 'single-minded' as earnest, resolute intent fixed on one thing alone and kept up steadily. Typical of someone who has devoted themselves single-mindedly to one craft, field, or path.

Both convey single-minded devotion and overlap heavily: 一途 leans toward wholehearted, often emotional devotion to a person or goal, while 一筋 leans toward earnest, resolute dedication to one pursuit kept up steadily.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 一途いちずsingle-minded
• 一本気いっぽんぎsingle-minded (esp. personality or person)
• ひたむきearnest
• 無二無三むにむさんin earnest
• ひたぶるdetermined
• 一筋ひとすじearnest