Not inclined to undertake new, risky enterprises.(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.
Use "unadventurous" in a sentence
"Hairdresser Nicky Clarke says Kate Middleton's hair is 'unadventurous'"
"Why is it considered "unadventurous" not to drink one's wine from a baby bottle?"
"First, I don't consider myself an unadventurous eater."