旺盛

1. Origins, structure, and basic meaning

• Structure: 旺盛 (おうせい) describes vigorous strength, appetite, or drive. The examples use a sentence-final predicate and a compound connective.
• Basic usage: 食欲が旺盛だ directly judges appetite; 好奇心旺盛で links strong curiosity to later willingness to try things.

2. Common pitfalls and similar expressions

• Predicating appetite and linking curiosity to action
  • The first closes a sentence with subject 食欲が; the second forms a unit with 好奇心 and continues. The strength belongs to the named drive, not indiscriminately to the whole person.