(This is a repeat post from last Halloween, but anyway
In Mary Shelley's original book, Frankenstein, or the Modern Prometheus
(published March 11th, 1818), Victor Frankenstein's "monster" was a vegetarian. Here is an excerpt from the book, wherein the "monster" asks Victor Frankenstein to create a female to be his companion:
“If you consent, neither you nor any other human being shall ever see us again; I will go to the vast wilds of South America. My food is not that of man; I do not destroy the lamb and the kid to glut my appetite; acorns and berries afford me sufficient nourishment. My companion will be of the same nature as myself and will be content with the same fare. We shall make our bed of dried leaves; the sun will shine on us as on man and will ripen our food. The picture I present to you is peaceful and human, and you must feel that you could deny it only in the wantonness of power and cruelty. Pitiless as you have been towards me, I now see compassion in your eyes; let me seize the favourable moment and persuade you to promise what I so ardently desire.”
Mary Shelley's original Frankenstein
novel is not really about a monster. It's about an individual brought to life with absolutely no family, with no upbringing, and with a physical appearance that people were horrified by. The novel describes the miserable life and desperate/violent actions of one such individual.
In the actual Frankenstein novel, the "monster" does not walk in a clumsy, lumbering way. Just the opposite - he is describe as being extremely fleet and quiet.
In the novel, the "monster" does not groan incomprehensibly. Just the opposite - he is an articulate speaker.