The word 贱人 is formed by directly combining two potent concepts: 贱 (jiàn), which carries a core meaning of being "lowly", "base", or "contemptible", often with a strong moral judgment of worthlessness, with 人 (rén), meaning "person". The formation isn't grammatical but conceptual, merging the idea of a vile character or quality with the entity of a person to create a single, unified insult that condemns the individual's entire being as despicable.