Not compatible with reality or fact; unreasonably idealistic: unrealistic expectations. (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 "unrealistic" in a sentence
"These include what she describes as unrealistic municipal demarcations."
"The Denver-based telecom (NYSE: Q) had signaled in January that it was reconsidering its earlier decision not to apply for available rural-broadband funds under the American Recovery and Reinvestment Act because of what it called unrealistic rules."
"Carlson criticized what he described as unrealistic and excessive federal spending coming from the White House."