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Definition of intruder : One who intrudes; one who thrusts himself in, or enters without right, or without leave or welcome; a trespasser.

Synonyms:

ass, disrupting element, meddler, yob, nosey parker, invader, vermin, child molester, intermeddler, con woman, encroacher, robber, unwelcome guest, trespasser, loudmouth, snoop, drug baron, drug lord, interferer, conman, gate-crasher, con artist, horror, public enemy number one, thief, (the) scum of the earth, public nuisance, fence, accessory, kibitzer, unwanted person, interrupter, trouble, creep, buttinsky, interloper, crasher, abductor, arsonist, know-all, prowler, busybody

Usage examples:

• As the girl beheld it she flung wide her arms and, with a cry, ran towards the intruder. - "The Son of his Father", Ridgwell Cullum.
• It was soon ascertained that the alarm was not without foundation, and the daring intruder was immediately secured, and safely handed over to the tender mercies of the police. - "Gossip in the First Decade of Victoria's Reign", John Ashton.
• There was a ringing sound as of coins falling on the floor, and a man who had been kneeling low over something sprang to his feet and gazed with wide, horror- stricken eyes at the intruder. - "The New Rector", Stanley J. Weyman.