"an undue and unsolicited thrusting forward of something upon the notice or attention of others," 1570s, from Latin obtrusionem (nominative obtrusio), noun of action from past-participle stem of obtrudere "to thrust into, press upon" (see obtrude).
obstructionist
obstructive
obtain
obtainable
obtrude
obtrusion
obtrusive
obtund
obtuse
obverse
obviate