What are the opposite words for slightness?

Slightness means a lack of significant weight, size or intensity, and some antonyms to this word include heaviness, magnitude, intensity, and significance. Heaviness refers to a considerable weight, size or gravity, while magnitude is used to describe something that is large or vast. Intensity is an antonym for slightness; it means having a high degree of power or energy. Finally, significance relates to the importance, value or relevance of something. All these antonyms depict opposite meanings of slightness and imply a more significant or substantial nature of the subject matter or situation being described.

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