Na Pa·li Coast (nä? pä?l?) A rugged coast of western Kauai in Hawaii. Its cliffs reach 1,220 m (4,000 ft) high.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.