Not pleasing to the taste: an unpalatable meal. (adjective)
Not pleasant or agreeable: unpalatable truths. (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 "unpalatable" in a sentence
"Apparently the seeds are bitter and unpalatable, which is why I had this task."
"They didn't even want to eat them (they were described as unpalatable)."
"It has been classified as unpalatable to rabbits, although they consumed significant amounts of it when mixed with grass and herbaceous leaves."