Favorite but lesser known words, and their definitions. Commonly misused or misapplied words and definitions. Good words to know. Words to be retired. I'll go first, and it's always tough as hell for me to pronounce: [h=1]indefatigable[/h] [in-di-fat-i-guh-buh l] [h=3]adjective[/h] incapable of being tired out; not yielding to fatigue; untiring.