pining pi·ning UK/ˈpaɪnɪŋ/ US/ˈpaɪnɪŋ/ uncommon noun 1. a feeling of deep longing Related words Word family pine Broader terms longing Narrower terms lovesickness WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.