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avoidant

British  
/ əˈvɔɪdənt /

adjective

  1. (of behaviour) demonstrating a tendency to avoid intimacy or interaction with others

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.