explosive

nouns

a chemical substance that undergoes a rapid chemical change (with the production of gas) on being heated or struck
is a part of
device that bursts with sudden violence from internal energy
is a type of (narrower)
material produced by or used in a reaction involving changes in atoms or molecules

adjectives

serving to explode or characterized by explosion or sudden outburst
"an explosive device"; "explosive gas"; "explosive force"; "explosive violence"; "an explosive temper"
antonym
is similar to
exploding almost instantaneously
liable to lead to sudden change or violence
"an explosive issue"; "a volatile situation with troops and rioters eager for a confrontation"
sudden and loud
"an explosive laugh"
is similar to
happening without warning or in a short space of time
"a sudden storm"; "a sudden decision"; "a sudden cure"