Intrusive

{{wiktionary|intrusive}}

Intrusive may refer to:

• Intrusiveness, a typically unwelcome behavior, interrupting and disturbing to others
• Intrusive rock, intrusion of molten magma leaving behind igneous rock
• Saltwater intrusion, the movement of saline water into freshwater aquifers
• Intrusive thought, an unwelcome involuntary thought, image, or unpleasant idea
• Linking and intrusive R, in phonetics