low-keyed vs restrained

low-keyed and restrained both are adjectives.

Word	Noun	Adjective	Verb	Adverb
low-keyed	No	Yes	No	No
restrained	No	Yes	No	No

low-keyed (adjective)	restrained (adjective)
restrained in style or quality	under restraint
	prudent
	marked by avoidance of extravagance or extremes
	cool and formal in manner
	not showy or obtrusive