This question is based on Emily Bronte's Wuthering Heights. From the events in the novel, one can conclude that Joseph is

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From the events in Emily Bronte's Wuthering Heights, Joseph is best described as hypocritical. Joseph is an old servant at Wuthering Heights who is fiercely religious, constantly quoting scripture and invoking God's judgement on others. However, his behaviour consistently contradicts the Christian values he preaches.

While Joseph proclaims piety and moral righteousness, he is harsh, mean-spirited, and uncharitable toward nearly everyone around him. He shows no compassion for the suffering of Catherine, Heathcliff, or the younger generation at Wuthering Heights. He is partial in his loyalties, quick to condemn others, and uses religion as a weapon to assert moral superiority rather than as a genuine guide for his own conduct. His public devotion to God is at odds with his private cruelty and selfishness.

He is not straightforward, because his outward religious piety conceals a judgmental and unkind nature. He is not amiable, as he is notoriously ill-tempered and difficult to get along with. And he is not unserious - on the contrary, he takes himself and his religious posturing very seriously.