Should one marry his beautiful maternal cousin of moderate religiosity, who has been described as unbearable in her speech and abusive towards elders, given his conflicting feelings of acceptance and rejection, and taking into account their age difference?

The Prophet, peace and blessings be upon him, advised choosing a religious wife for her ability to bear the responsibilities of marriage and raising children. If beauty, lineage, and wealth are added to that, it is even better. In your case with your cousin's daughter, there are two options: The first is to marry her and postpone consummation for a period to guide and correct her. If her character improves, then proceed with the marriage; otherwise, turn away from her. The second is to leave her and seek another wife, especially since your mind is not at ease with her. Remember that there are many upright women, so there is no need for hesitation.