  It was recently shown that the metric functions which describe a spherically
symmetric space-time with vanishing radial pressure can be explicitly
integrated. We investigate the nakedness and curvature strength of the
shell-focusing singularity in that space-time. If the singularity is naked, the
relation between the circumferential radius and the Misner-Sharp mass is given
by $R\approx 2y_{0} m^{\beta}$ with $ 1/3<\beta\le 1$ along the first radial
null geodesic from the singularity. The $\beta$ is closely related to the
curvature strength of the naked singularity. For example, for the outgoing or
ingoing null geodesic, if the strong curvature condition (SCC) by Tipler holds,
then $\beta$ must be equal to 1. We define the ``gravity dominance condition''
(GDC) for a geodesic. If GDC is satisfied for the null geodesic, both SCC and
the limiting focusing condition (LFC) by Kr\'olak hold for $\beta=1$ and
$y_{0}\ne 1$, not SCC but only LFC holds for $1/2\le \beta <1$, and neither
holds for $1/3<\beta <1/2$, for the null geodesic. On the other hand, if GDC is
satisfied for the timelike geodesic $r=0$, both SCC and LFC are satisfied for
the timelike geodesic, irrespective of the value of $\beta$. Several examples
are also discussed.
