Does this sentence make sense:
"I feel SAFE to say that if a book doesn't have any purpose, it is worthless."
Note: I'm particularly interested in the use of the adjective 'safe'.
Yes, it's fine. ". org/dictionary/english/it-s-safe-to-say-that
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Yes, it's fine.
The actual idiom is "It's safe to say that...".
https://dictionary.cambridge.org/dictionary/english/it-s-safe-to-say-that