The term tuccha means in Classical Sanksrit "worthless", "insignificant". In Vedānta, however, it gets a more specific technical meaning, to denote the absolute unreality of chimeral entities, such as the khapuṣpa (flower in the air), which will not and cannot ever exist. You can read the rest at my new blog, here.
In Memoriam: Russell Hardin (1940-2017)
8 hours ago