Of speech or writing: indicative or expressive of strong emotion (now esp. anger, hatred, etc.); fervent, impassioned.

Of an utterance, passage of writing, etc.: very forcibly or passionately expressed or delivered; that is an expression or indication of strong…

figurative. Clamorous, noisy; also, in more favourable sense, emphatic or vehement in expression.

Of the colour of flame.

quasi-adj. Explosive.

transferred. Resembling a dithyramb in irregularity of style; wild, vehement, boisterous.

Esp. of a person's mental or emotional state: fervent, inflamed; stimulated; animated. Cf. fire, v.1 2 and fired-up adj. at compounds.