ADJ-GRADED
（指说话、写作或举止）自命不凡的，装腔作势的
If someone's way of speaking, writing, or behaving is portentous, they speak, write, or behave more seriously than necessary because they want to impress other people.
例句
There was nothing portentous or solemn about him. He was bubbling with humour.
他一点也不装腔作势或故作严肃，浑身散发着幽默。
...portentous prose.
矫揉的散文