General alternatives:
* Appeared to
* Looked like
* Gave the impression of
* Suggested
* Indicated
* Implied
* Convinced
* Persuaded
* Felt like
* Sounded like
More specific alternatives:
* Glimmered (for a faint or subtle impression)
* Hinted (for a subtle or indirect suggestion)
* Evinced (for a clear or obvious indication)
* Whispered (for a faint or subtle suggestion)
* Shouted (for a strong or obvious impression)
Example:
* Original: The dog seemed to be happy.
* Alternatives: The dog appeared to be happy. / The dog looked like it was happy. / The dog gave the impression of happiness.
The best alternative will depend on the specific context and the intended meaning.