(~s)
1.
If you describe something or someone as ~, you think they will have harmful effects.
Inflation is considered to be ~ because of its adverse effects on income distribution...
A large group of ~ strangers crashed her party.
ADJ
2.
Undesirables are people who a particular government considers to be dangerous or a threat to society, and therefore wants to get rid of.
The Home Office is usually quick to deport ~s.
N-COUNT