Gargantuan definitions

gär-găn'cho͝o-ən
Of immense size, extent, or quantity.
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Of exceedingly great scope or nature.

A gargantuan effort.

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Of a tremendous size, volume, degree, etc.
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The definition of gargantuan is enormous or gigantic.

A 10-foot high mountain of chocolate bars would be an example of a gargantuan amount of chocolate.

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Enormous; gigantic.
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Origin of gargantuan

From Gargantua, a giant with a very large appetite in Rabelais's The Inestimable Life of Gargantua.