My philosophy lecturer is unfailingly bombastic.

Answer: Option A

Pompous : affectedly grand, solemn, or self-important.
Impressive : evoking admiration through size, quality, or skill; grand, imposing, or awesome.
Impressionistic : based on subjective reactions presented unsystematically.
Sensitive : quick to detect or respond to slight changes, signals, or influences.
Bombastic : high-sounding but with little meaning; inflated.

Synonym of Bombastic is Pompous