General:
* Implies
* Suggests
* Hints
* Implicates
* Indicates
* Alludes to
* Hinted at
More negative connotations:
* Hinted (can be more subtle)
* Impugns (suggests a negative quality)
* Inveighs against (implies strong criticism)
* Slanders (suggests malicious intent)
More specific:
* Whispers (implies secrecy)
* Innuendos (suggests suggestive or sexual implications)
* Backbites (implies gossip)
The best synonym will depend on the specific context and the intended meaning.