Intrusive Definition

ĭn-tro͝osĭv, -zĭv
adjective
Intruding or tending to intrude; constituting intrusion.
Webster's New World
Designating or of igneous rock formed from magma that hardened while still within the earth, moon, etc.
Webster's New World
Present or added in speech although not represented originally in spelling or accounted for otherwise etymologically (Ex.: the d added to OE spinel to form spindle)
Webster's New World
Epenthetic.
American Heritage
The definition of intrusive is someone or something that invades personal space, that becomes too involved or that comes too close without being invited.
An unwelcome and overly personal question is an example of a question that would be described as intrusive.
A person who constantly comes over to your house uninvited and offers unsolicited life advice is an example of a person who would be described as intrusive.
YourDictionary
Antonyms:
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noun

(geology) An igneous rock that is forced, while molten, into cracks or between other layers of rock.

Wiktionary

Other Word Forms of Intrusive

Noun

Singular:
intrusive
Plural:
intrusives

Origin of Intrusive

  • Back-formation from intrusion.

    From Wiktionary

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Unscrambles

intrusive