Quotes:Nirguna
H. P. Blavatsky
Nirguna. Negative attribute; unbound, or without Gunas (attributes), i.e., that which is devoid of all qualities, the opposite of Saguna, that which has attributes (Secret Doctrine, II. 95), e.g., Parabrahmam is Nirguna; Brahmâ, Saguna. Nirguna is a term which shows the impersonality of the thing spoken of.
Source: H. P. Blavatsky, The Theosophical Glossary, art. Nirguna