giantly adjective 1adverb 1forms 2 adjective1 •Characteristic to, resembling, or relating to a giant or giants; giantlike.What meanes this deuilish shepheard to aspire With such a giantly presumption. To cast vp hils against the face of heauen: And dare the force of angry Iupiter. — 1587 adverb1 •In a giant or gigantic manner; gigantically; enormously; immensely.Lexa dropped her book. “Okay, that was giantly huge!” — 2012 formsmore giantly · most giantly