Un·ob·tru·sive a. Not obtrusive; not presuming; modest. -- Un*ob*tru*sive*ly, adv. -- Un*ob*tru*sive*ness, n.
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unobtrusively
adv : in an unobtrusive manner; "messengers were moving
unobtrusively over the jet-black mountain ranges,
bearing confidential tidings from sheikhdom to
sheikhdom" [ant: obtrusively]