Wary (adjective)

1. Cautiously watchful and alert to possible danger or problems.
2. Hesitant or unwilling to trust or believe something or someone.

Origin:

Middle english: from old northern french wari, from a germanic word meaning "watchful".

Examples:

1. She was wary of strangers and never talked to them.
2. He was wary of investing in the stock market after the recent crash.
3. The government was wary of the new technology and its potential consequences.
4. The company was wary of the new regulations and their impact on its business.
5. She was always wary of making the same mistake twice.