acousmatic
/ˌakuːzˈmatɪk/noun
A member of a group of disciples of Pythagoras who unquestioningly followed his doctrines and precepts rather than studying his scientific proofs and demonstrations. Opposed to mathematic, mathematician.
adjective
1Of, relating to, or characteristic of this group. Also in extended use: thoughtless, unthinking.
2Of, designating, or characterized by sound produced without a visible source, or a visual component or association; audible but unseen.
Origin
Mid 17th century; earliest use found in Thomas Stanley (1625–1678), poet and classical scholar. From post-classical Latin acusmaticus and its etymon Byzantine Greek ἀκουσματικός probationer in the school of Pythagoras, lit. ‘person willing to hear’ from ancient Greek ἀκουσματ-, ἄκουσμα + -ικός.