過剰

1. Origins, structure, and basic meaning

• Structure: 過剰 is read as かじょう and is a noun and na-adjective for an amount, degree, or response exceeding what is needed or appropriate.
• Basic usage: Excessive packaging appears in 過剰な包装, while caution becoming excessive appears in 警戒が過剰になる.

2. Common pitfalls and similar expressions

• Beyond an appropriate level
  • It does more than indicate a large amount; it evaluates something as beyond what the situation requires.
• Difference from 余分
  • Compared with something merely extra or left over, this word more strongly judges the excess as problematic.