一生懸命

1. Origins, structure, and basic meaning

• Structure: 一生懸命 (いっしょうけんめい) is an adverb describing wholehearted effort toward accomplishing a goal.
• Basic usage: 一生懸命練習した describes wholehearted practice to learn cycling, while 一生懸命働いた describes diligent work preceding a desired rest.

2. Common pitfalls and similar expressions

• Manner of effort and result
  • 一生懸命練習する and 一生懸命働く modify the intensity of effort without guaranteeing success. The goal in the first and the rest in the second are distinct outcomes.