Atonic
From BiblePortal Wikipedia
Atonic [1]
(1): (n.) An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing.
(2): (a.) Characterized by atony, or want of vital energy; as, an atonic disease.
(3): (a.) Unaccented; as, an atonic syllable.
(4): (a.) Destitute of tone vocality; surd.
(5): (n.) A word that has no accent.
(6): (n.) A remedy capable of allaying organic excitement or irritation.