  We present the currently most precise predictions for the $W$-boson mass and
the leptonic effective mixing angle $\sin^2\theta_{\text{eff}}$ in the aligned
Two-Higgs-Doublet Model. The evaluation includes the full one-loop result, all
known higher-order corrections of the Standard Model, and the non-standard
two-loop contributions that increase with mass splittings between charged and
neutral THDM Higgs bosons. They depend on $\tan\beta$ and the soft
$Z_2$-symmetry breakingparameter $m_{12}^2$ of the scalar potential, in
addition to the non-standard boson masses. Whenever the one-loop corrections
become large, the two-loop contributions yield substantial modifications of the
predictions, which is of particular importance for the $W$ mass where large
mass shifts are required to reach the recently published final resultof the CDF
collaboration. Numerical results are shown for the dependence on the various
non-standard parameters and in comparison with experimental data.
