Insisting capriciously on getting just what one wants; difficult to please; fastidious: a finicky eater. (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 "finicky" in a sentence
"On the other hand, no one that stands in finicky dread of it and similar diseases can afford to travel in the South Seas."
"For example, what the researchers term a "finicky slow student" - one obsessed with constant review at a very slow pace - will never perfectly learn a given topic."
"Poinsettias, for example, are known as finicky plants that crave dark more than light, and which will die without that proper care."