Ending in a peak; pointed: a peaked cap. (adjective)
Having a sickly appearance: You're looking a little peaked today. (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 "peaked" in a sentence
"According to the Twitter trend tracking site Twist (image above), use of the term peaked on Sunday morning and has since decayed."
"And then just the last question maybe for Ken: the 5.4% Building margin, do you think there's upside to that or has that in your term peaked?"
"This in some degree corresponds with Captain Cook's record of the irregularity of his compass when he passed near this part of the coast, in consequence of which he called the peaked island to the westward of the cape, Magnetical Island: this irregularity, however, was not noticed by me in my observations near the same spot; and the difference observed by him may very probably have been occasioned by the ship's local attraction, which in those days was unknown."