Definition of "shadowy" []

• Relating to or resembling a shadow. (adjective)
• Full of or dark with shadow. See Synonyms at dark. (adjective)
• Lacking distinctness; faint. (adjective)
• Lacking substance; unsubstantial. (adjective)

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.

• "Mr Obama has consistently railed against what he called "shadowy groups with harmless-sounding names", even using his 2010 State of the Union address to attack the Supreme Court for allowing their creation."
• "The government witness Atef Shafik, a senior language analyst for the FBI, made the argument that Muslims using common phrases that refer to peace and God are terrorists because the phrases reveal that they are Islamists, and this makes them part of the Muslim Brotherhood, which he described as a shadowy anti-Israel organization that calls for the destruction of the Western civilization from within, in order to replace it with an Islamic society."
• "Are you going to suggest that talent is best served in shadowy corners of the industry?"