WordNet sense 1 (make overcast or cloudy):

overcast

WordNet sense 2 (come back after being refused):

bounce

WordNet sense 3 (find or declare guilty):

convict, convict

WordNet sense 4 (poorly stated or described):

unclear, ill-defined

WordNet sense 5 (full of or covered with clouds):

cloudy

WordNet sense 6 (not clear; not transmitting or reflecting light or radiant energy):

opaque

WordNet sense 7 (fill a space in a disorderly way):

clutter