An inexperienced or immature person, especially one who is easily deceived. (noun)
A newcomer, especially one who is unfamiliar with the ways of a place or group. (noun)
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 "greenhorn" in a sentence
"At the word greenhorn Abe Potash leaned forward and struck the table with his open hand."
"Being a "greenhorn" -- i.e., just off the boat -- was a put down back when your professor, PT, was coming up."
"A fool of a greenhorn was a-managin 'of the thing, an' this is the result."