unheard-of
- adjective (adj)
Meaning: unique, obscure
Synonyms:
exceptional
inconceivable
little-known
nameless
new
novel
outlandish
preposterous
rare
shocking
singular
unbelievable
undiscovered
unfamiliar
unknown
unlikely
unprecedented
unrenowned
unsung
unusual
Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.