adj

1. characterized by oppressive heat and humidity

e.g. the summer was sultry and oppressive
the stifling atmosphere
the sulfurous atmosphere preceding a thunderstorm

Synonym: sultrystiflingsulfurous

2. harsh or corrosive in tone

e.g. an acerbic tone piercing otherwise flowery prose
a barrage of acid comments
her acrid remarks make her many enemies
bitter words
blistering criticism
caustic jokes about political assassination, talk-show hosts and medical ethics
a sulfurous denunciation
a vitriolic critique

Synonym: acerbacerbicacidacridbitterblisteringcausticsulfurousvirulentvitriolic

3. of or related to or containing sulfur or derived from sulfur

Synonym: sulfurous