Definition of volatile for English Language Learners. : 1  likely to change in a very sudden or extreme way. : 2  having or showing extreme or sudden changes of emotion. : 3  likely to become dangerous or out of control.
expletive (comparative more expletive, superlative most expletive) 1  Serving to fill up, merely for effect, otherwise redundant. 2  Marked by expletives (phrase-fillers).
1 a word or remark expressing emotion; exclamation. 2  the act of interjecting. 3  a word or phrase that is characteristically used in syntactic isolation and that usually expresses sudden emotion; expletive.