Which adjective describes language that is pompous or overblown, often hiding a lack of ideas?

The adjective that best captures language that is pompous or overblown is "bombastic." This term specifically refers to speech or writing that is high-sounding and extravagant, often used to impress rather than to convey meaningful ideas. Bombastic language might include elaborate vocabulary or grandiose expressions that mask a lack of substantial content, leading to a sense that the communication is more about style than clarity or depth of thought.

In contrast, "verbose" signifies a tendency to use more words than necessary, which may or may not be pompous. It emphasizes length rather than the inflated quality that "bombastic" conveys. "Obvious" suggests something clear or easily understood, and "simple" indicates straightforwardness or lack of complexity. Neither of these options aligns with the idea of language that is excessively ornate or pretentious, which is the cornerstone of "bombastic."