lower class

[loh-er] /ˈloʊ ər/
noun
1.
a class of people below the middle class, having the lowest social rank or standing due to low income, lack of skills or education, and the like.
2.
(broadly) working class.
Origin
1765-75

lower-class

[loh-er-klas, -klahs] /ˈloʊ ərˈklæs, -ˈklɑs/
adjective
1.
of, pertaining to, or characteristic of the lower class:
lower-class values.
Origin
1890-95
British Dictionary definitions for lower class

lower class

noun
1.
the social stratum having the lowest position in the social hierarchy Compare middle class, upper class, working class
adjective
2.
of or relating to the lower class
3.
inferior or vulgar