Not likely to please; objectionable: undesirable intrusions.
Not wanted: undesirable aliens.
A person regarded as undesirable: "men tentatively regarded as scoundrels—or at least as undesirables” ( New York).
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.