1. not wanted or wished for; harmful or unpleasant

1. a person considered to be objectionable or unwanted
Usage: often offensive when referring to people

Examples

• The medication may cause undesirable side effects.
• Smoking is an undesirable habit that damages your health.
• The new policy had several undesirable consequences.
• They tried to eliminate undesirable elements from the neighborhood.
• The company wanted to avoid any undesirable publicity.
• His rude behavior made him an undesirable guest.
• The government labeled certain immigrants as undesirables.