From Hindupedia, the Hindu Encyclopedia
By Swami Harshananda
Asiddha literally means ‘unproved’.
While discussing ‘hetvābhāsa’ or fallacy of inference, the Nyāya system (Logical Theism of Gautama) lists five kinds of material fallacies of which ‘asiddha’ forms the fourth. When it is said that ‘the sky-lotus is fragrant, because it has attributes of a natural lotus,’ the pakṣa or the minor term viz., the ‘sky-lotus’ has no locus standi (being only an ābhāsa or an appearance) and hence the syllogism becomes ‘asiddha’ or unproved.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore