adynamic vs backward

adynamic and backward both are adjectives.

Word	Noun	Adjective	Verb	Adverb
adynamic	No	Yes	No	No
backward	No	Yes	No	Yes

adynamic (adjective)	backward (adjective)
characterized by an absence of force or forcefulness	directed or facing toward the back or rear
lacking energy or vitality	(used of temperament or behavior) marked by a retiring nature
	retarded in intellectual development
	having made less than normal progress

adynamic (adverb)	backward (adverb)
	in a manner or order or direction the reverse of normal
	in or to or toward a past time
	at or to or toward the back or rear