完全

1. Origins, structure, and basic meaning

• Structure: 完全 (reading かんぜん) is a noun and na-adjective for a state that is whole and free of omissions or defects.
• Basic usage: Use 完全に乾く to modify the degree of an action and 完全な状態 to describe a noun.

2. Common pitfalls and similar expressions

• Inflected forms
  • Use 完全に before a verb and 完全な before a noun.
• Not merely a high degree
  • 完全 presupposes nothing is lacking; it does not simply mean very good or nearly finished.