確実

1. Origins, structure, and basic meaning

• Structure: Written 確実 and read かくじつ, it describes a fact or outcome as certain, or an action as carried out dependably without omission.
• Basic usage: It is used to ensure delivery by checking an address and to withhold a claim that success is certain.

2. Common pitfalls and similar expressions

• Certain outcome versus reliable execution
  • The adjective can judge probability, while the adverb can describe dependable performance.