[dragonwriter]

> Come with specifics or this is just slander.

Whether or not specifics are provided is irrelevant as to whether or not it's slander.

Specifics may be relevant to whether you personally believe it, but that's also not relevant to whether it is factually slander.

[Smithalicious]

Ah, I wasn't aware, sorry. Is there an English word that constitutes an accusation against someone with no proof?

[CocaKoala]

Allegation is the word you're looking for.

> a claim or assertion that someone has done something illegal or wrong, typically one made without proof.