semi-transparent; translucent
feeling of transparency; sense of translucence; clear and unclouded feel (e.g. of a voice, skin, etc.); bright and limpid impression; transparency (of a process, activity, etc.); clarity of how things work
invisible person (in science fiction, etc.)
opaque; obscure; opacity; obscurity; unclear; unpredictable
transparency; degree of clearness
colorless and transparent
watercolor; transparent watercolor (as opposed to gouache); aquarelle
ghost runner; placeholder used when fewer than 9 members are present on a team