semiperspicuous

from The Collaborative International Dictionary of English v.0.48

Semiperspicuous \Sem`i*per*spic"u*ous\
   (s[e^]m`[i^]*p[~e]r*sp[i^]k"[-u]*[u^]s), a.
   Half transparent; imperfectly clear; semipellucid.
   [1913 Webster]