unstable vs shaky

unstable and shaky both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unstable	No	Yes	No	No
shaky	No	Yes	No	No

unstable (adjective)	shaky (adjective)
lacking stability or fixity or firmness	not secure; beset with difficulties
subject to change; variable	inclined to shake as from weakness or defect
suffering from severe mental illness	vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze
disposed to psychological variability
highly or violently reactive
affording no ease or reassurance