The Oxford Thesaurus An A-Z Dictionary of Synonyms - expletive adj.

1) wordy, verbose, prolix, repetitious, redundant, tautological, iterative, reiterative, pleonastic; unnecessary, unneeded, needless, unessential, non-essential, gratuitous, superfluous: Her speech is punctuated by expletive words and phrases, like 'like, you know', and so forth. --n. 2) oath, swear-word, curse, obscenity, epithet, Colloq cuss-word, dirty word, four-letter word: Expletives sometimes lend an air of naturalness to written dialogue. 3) filler, padding, redundancy, tautology, pleonasm: Some grammarians term the 'It' in 'It is raining' an expletive.