unassuming

adj

1. Modest and having no pretensions or ostentation.

   “Various bridges were required, including a lofty one at Brantham, but money was saved by providing unassuming structures at the three intermediate stations.”

   “The crews themselves throughout were an interesting study. The drivers, as older men, bore that air of quite unassuming competence, as British drivers have always done and which in any field has come to be regarded as characteristic of men bearing heavy responsibility to which at the same time they are equal.”