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Not guaranteed to be useful despite appearances or expectations.
虽然这个软件功能很多，但未必有用。
Although this software has many features, it's not necessarily useful.
他推荐的书未必有用，因为内容太理论化了。
The book he recommended isn't necessarily useful because it's too theoretical.
Often used to express skepticism about something's practical value.
Use '未必有用' when you want to politely express skepticism about something's practical value, especially after someone praises it. It's softer than saying '没用' (useless).
The phrase follows the pattern: [Subject] + 未必 + 有用. The '有用' can sometimes be replaced with other positive attributes like '管用' (effective) or '好用' (easy to use).
Literally 'not necessarily have use' (未必 'not necessarily' + 有用 'useful'). The phrase combines two common Chinese constructions to express doubt about practical value.
Commonly used in everyday conversation to express that something may not be as effective or practical as it seems. Often follows a statement about something's features or potential.