portentous

Well may it sort [be fitting] that this portentous figure comes armed through our watch, so like the King that was and is the question of these wars.

It is no longer in my possession, but my memory holds almost every word of its portentous message; and again I affirm my confidence in the sanity of the man who wrote it.

The chaplain's first mention of the name Yossarian! had tolled deep in his memory like a portentous gong.

Of late, this portentous mansion has begun to give signs of dilapidation and decay.