Entry 1 sense Webster, 1913 Grandfatherly · Grand·fa·ther·ly · IPA /ɡrˈændfˌɑðərliː/ 01 a. Like a grandfather in age or manner; kind; benignant; indulgent. 1. Like a grandfather in age or manner; kind; benignant; indulgent. “He was a grandfatherly sort of personage.” — Hawthorne.