Humble meaning

cause (someone) to feel less important or proud.

having or showing a modest or low estimate of one's importance.

Ex. "I felt very humble when meeting her"

(of a thing) of modest pretensions or dimensions.

Ex. "he built the business empire from humble beginnings"

to make someone understand that they are not as important or special as they thought they were

Synonymous :- 

unpretentious

modest

unostentatious

plain

simple

ordinary