愚直

1. Origins, structure, and basic meaning

• Structure: 愚直 is a noun and na-adjective read ぐちょく, describing a straightforward, single-minded attitude that avoids clever shortcuts.
• Basic usage: Use the adverbial form 愚直に to modify an action and the attributive form 愚直な before a noun.
  • 彼は愚直に基本練習を続けた。 describes him steadfastly continuing basic practice; 愚直な姿勢が少しずつ信頼につながった。 says that the straightforward attitude gradually led to trust.

2. Common pitfalls and similar expressions

• 愚直に続ける
  • The adverbial に describes the manner of continuing as unwavering and straightforward.
• 愚直な姿勢
  • The na-adjective linker な is required before the noun 姿勢.
• The evaluation in 愚直
  • It can praise honesty and persistence, but context may also suggest a lack of flexibility, so it is not automatically unqualified praise.