ἀταλός

Etymology
Leumann derives this adjective from, which is the negation of. Although it explains the compositional vowel α-, the whole analysis is too complicated. Derivation from seems improbable too. Furnée compares and concludes that this is a  word, which is quite probable.

Adjective

 * 1)  tender, delicate
 * 2)  tremulous, shaking, trembling