Answer
$HF$ is a weak acid.
Conjugate base: $F^-$, which is a weak base.
Work Step by Step
$HF(aq) + H_2O(l) --> F^-(aq) + H_3O^+(aq)$
As we can see in this reaction, $F^-$ is the conjugate base of $HF$.
Since $HF$ is a weak acid, $F^{-}$ will be a weak base.
