  We study the singularities of the secant variety $\Sigma(X,L)$ associated to
a smooth variety $X$ embedded by a sufficiently positive adjoint bundle $L$. We
show that $\Sigma(X,L)$ is always Du Bois singular. Examples of secant
varieties with worse singularities when $L$ has weak positivity are provided.
We also give a necessary and sufficient condition for $\Sigma(X, L)$ to have
rational singularities.
