opaque /ō-pākˈ/

1. Shady
2. Dark
3. Dull
4. That cannot be seen through
5. Impervious to light or to radiation of some particular kind
6. Obscure, hard to understand
7. Impervious to sense
8. Doltish

1. Something, eg a space or medium, that is opaque
2. A substance used to block out areas of a negative (photography)

To make opaque

opacity /ō-pasˈi-ti/ noun

Opaqueness

• have one's collar felt
• have one's ear to the ground
• have oneself to thank for
• have one's end away
• have one's eye on
• have one's face lifted
• have one's feet on the ground
• have one's fill of
• have one's finger on the button
• have one's fingers all thumbs
• have one's hands full
• have one's head screwed on
• have one's head screwed on the right way
• have one's heart in it
• have one's heart in one's boots
• have one's heart in one's mouth
• have one's heart in the right place
• have one's heart set on
• have one's knife in
• have one's marbles
• have one's monkey up
• have one's name in the Gazette
• have one's own way
• have one's shirt out
• have one's way