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Gargantuan
Intensity Amplifier
Use 'gargantuan' to highlight the exceptional size or scale of something, more than 'big' or 'large' would. 
Visual Impact
'Gargantuan' often creates a strong visual impression, suggesting something is impressively large or overwhelming. 
Not Literal
Sometimes 'gargantuan' is used figuratively to describe non-physical things like tasks or achievements. 