unobtrusive

adj

1. Not obtrusive; not blatant or noticeable; discreet, inconspicuous.

   “Ye Quietiſts, in Homage to the Skies! / Serene! of ſoft Addreſs! vvho mildly make / An unobtruſive Tender of your Hearts, / Abhorring Violence!”

   “[T]hey were not the spoiled children of affectation and refinement, but a bold, vigorous, independent race of thinkers, with prodigious strength and energy, with none but natural grace, and heartfelt unobtrusive delicacy.”

   “Like some poor devils ashore that happen to know an irascible great man, they make distant unobtrusive salutations to him in the street, lest if they pursued the acquaintance further, they might receive a summary thump for their presumption.”

   “Behind an unobtrusive iron door in Dalston decorated with an ever-changing graffiti skin, lies a staircase leading down to a concrete bunker dating from the second world war.”

   “This unobtrusive device helps millions of Americans sleep and concentrate by hushing the world around them.”