backward vs reserved

backward and reserved both are adjectives.

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

backward (adjective)	reserved (adjective)
directed or facing toward the back or rear	marked by self-restraint and reticence
(used of temperament or behavior) marked by a retiring nature	set aside for the use of a particular person or party
retarded in intellectual development
having made less than normal progress

backward (adverb)	reserved (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