I am genuinely confused about the reasoning behind you asking this question...
The word 'in' would be a preposition in the example sentence you gave.
I genuinely want to be a Proffesional Tennis PlayerI genuinely think you don't want to go on holidayYou genuinely don't sound so pleasedHe genuinely said they won the prize
I really am genuinely fond of the little darling.
The word is spelled as you have done in the question.
Please accept my apologies I am genuinely sorry.
I have...It's not very difficult, he seems to include that word in every sentence
I am GENUINELY sorry that you had to ask a question like this.
genuinely.
The phrase keep going genuinely has many synonyms and sentence structures to its definition. Some of which include, maintaining a specific action or to carry on with a specific order of activity.
A SENTENCE WITH THE WORD OUNCE A SENTENCE WITH THE WORD OUNCE A SENTENCE WITH THE WORD OUNCE A SENTENCE WITH THE WORD OUNCE
a sentence with the word variety
The comparative is "more genuinely."