1. tending or apt to intrude; coming without invitation or welcome: intrusive memories of a lost love.
  2. characterized by or involving intrusion.
  3. intruding; thrusting in.
  4. Geology.
    1. (of a rock) having been forced between preexisting rocks or rock layers while in a molten or plastic condition.
    2. noting or pertaining to plutonic rocks.
  5. Phonetics. excrescent(def 2).

Origin of intrusive

late Middle English word dating back to 1375–1425; see origin at intrusion, -ive
Related formsin·tru·sive·ly, adverbin·tru·sive·ness, nounnon·in·tru·sive, adjectivenon·in·tru·sive·ly, adverbun·in·tru·sive, adjectiveun·in·tru·sive·ly, adverb

Synonyms for intrusive Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for non-intrusive

Historical Examples of non-intrusive

  • The internal body structure was visualized by using a simulation system similar to those utilized in non-intrusive surgery.

British Dictionary definitions for non-intrusive


  1. characterized by intrusion or tending to intrude
  2. (of igneous rocks) formed by intrusionCompare extrusive (def. 2)
  3. phonetics relating to or denoting a speech sound that is introduced into a word or piece of connected speech for a phonetic rather than a historical or grammatical reason, such as the (r) often pronounced between idea and of in the idea of it
Derived Formsintrusively, adverbintrusiveness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for non-intrusive



c.1400, from Latin intrus-, past participle stem of intrudere (see intrusion) + -ive. Related: Intrusively; intrusiveness.

Online Etymology Dictionary, © 2010 Douglas Harper