1. atonic - Noun
2. atonic - Adjective
Characterized by atony, or want of vital energy; as, an atonic disease.
Unaccented; as, an atonic syllable.
Destitute of tone vocality; surd.
A word that has no accent.
An element of speech entirely destitute of vocality, or produced by the breath alone; a nonvocal or surd consonant; a breathing.
A remedy capable of allaying organic excitement or irritation.
Source: Webster's dictionaryan atonic syllable carries no stress Source: Internet
Atonic seizures involve the loss of muscle activity for greater than one second. Source: Internet