楽観

1. Origins, structure, and basic meaning

• Structure: 楽観, read らっかん, denotes an optimistic attitude that expects a favorable outcome.
• Basic usage: It appears when warning against confidence without preparation and when keeping a backup plan for adverse possibilities.

2. Common pitfalls and similar expressions

• Hope versus unsupported optimism
  • The examples caution against optimism that discounts risk without evidence, rather than rejecting hopeful thinking itself.