Englishvehement
adjective
parents are vehement in their support for the school:
passionate, forceful, ardent, impassioned, heated, spirited, urgent, fervent, fervid, strong, forcible, powerful, emphatic, vigorous, animated, intense, violent, fierce, earnest, eager, keen, enthusiastic, zealous, fanatical;
loud, noisy, clamorous, vocal, vociferous, outspoken, strident, forthright, insistent.
▷antonyms mild, apathetic.
vehement Oxford Dictionary of English