Deficient in conviction or courage; timid.(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 "faint-hearted" in a sentence
"Regulating pornography is not for the faint-hearted."
"Similarly, the New English's bone china heart isn't a gift for the faint-hearted."
"Our nation was not built by faint-hearted cowards and couch potatoes."