a. Not to be summed up or computed; so great that the amount can not be ascertained; incalculable; inestimable. “Sumless treasure.” Pope. [ 1913 Webster ]
a. Destitute or deprived of the sun or its rays; shaded; shadowed. [ 1913 Webster ]
The sunken glen whose sunless shrubs must weep. Byron. [ 1913 Webster ]