Intrusive

wiktionary

ref

Back-formation from  intrusion, +‎  -ive. 

etymonline

ref

intrusive (adj.)

c. 1400, "usurping," from Latin intrus-, past participle stem of intrudere (see intrusion) + -ive. Meaning "coming unbidden" is from 1640s. Geological sense "thrust in out of regular place" is from 1826. Related: Intrusively; intrusiveness.