dualityThe concept of something being twofold, often with opposite parts or in contrast of each other.
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The state or quality of being two or in two parts."The duality of human nature is a prevailing theme in the story."
repressionPreventing the expression or development of certain emotions, actions or desires.
Definitions:
The action of subduing someone or something by force."Dr. Jekyll practiced repression of his darker desires."
The unconscious exclusion of painful impulses, desires, or fears from the conscious mind."The repression of his illicit desires caused him distress."
depravityA state of morality that is corrupt, evil or perverted.
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Moral corruption or degradation."The depravity of Mr. Hyde was shocking."
alter egoA person's secondary or alternate personality.
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A second self or different version of oneself."Mr. Hyde was effectively Dr. Jekyll's alter ego."
transformTo change the form or appearance of something.
Definitions:
To change in form, appearance, or structure; metamorphose."Dr. Jekyll would transform into Mr. Hyde."
To change in condition, nature, or character."His personality was transformed by the experiment."