  We apply the diabatic approach, specially suited for a QCD based study of
conventional (quark-antiquark) and unconventional (quark-antiquark +
meson-meson) meson states, to the description of hidden-bottom mesons. A
spectral analysis of the $I=0$, $J^{++}$ and $1^{--}$ resonances with masses up
to about $10.8$ GeV is carried out. Masses and widths of all the experimentally
known resonances, including conventional and unconventional states, can be well
reproduced. In particular, we predict a significant $B\bar{B}^{\ast}$ component
in $\Upsilon(10580)$. We also predict the existence of a not yet discovered
unconventional $1^{++}$ narrow state, with a significant
$B_{s}\bar{B}_{s}^{\ast}$ content making it to decay into $\Upsilon(1S)\phi$,
whose experimental discovery would provide definite support to our theoretical
analysis.
