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Adverb: gigantically  jI'gan-ti-k(u-)lee
  1. To an exceedingly great extent or degree
    "He had gigantically overestimated his resources"
    - vastly, immensely, colossally

Nearest

giga-
giga electron volt
gigabit
gigabyte
gigacycle
gigacycle per second
gigaelectron volt
gigaflop
gigahertz
gigantic
gigantically
gigantism
Gigartinaceae
gigawatt
gigayear
giggle
giggler
giggly
GIGO
gigolo
gigot