Atonic

Definition:

(a.) Characterized by atony, or want of vital energy; as, an atonic disease.
(a.) Unaccented; as, an atonic syllable.
(a.) Destitute of tone vocality; surd.
(n.) A word that has no accent.
(n.) An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing.
(n.) A remedy capable of allaying organic excitement or irritation.

Compare atonic with other words:

agonic vs. atonic