invasive

spreading intrusively or entering where unwanted

Root

vad / vas: go, move, or pass through

Other words with the vad / vas root

evade: to avoid or escape
evasive: avoiding direct answer or capture
invade: to enter forcefully or intrusively
pervade: to spread throughout
pervasive: spread throughout or present everywhere

Vad / vas gives go. Invasive things go in where they are not wanted and keep spreading.

The invasive plant spread across the field and crowded out the native flowers.

Invasive is not just entering. It is entering with pressure. A question, plant, surgery, species, or policy can cross a boundary and refuse to stay small.