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Definition of expletive : 1. A word, letter, or syllable not necessary to the sense, but inserted to fill a vacancy; an oath.
2. Filling up; hence, added merely for the purpose of filling up; superfluous.

Synonyms:

chap, gadfly, fellow, scourge, condemnation, blighter, lad, words, torment, pest, interjection, epithet, feller, nemesis, execration, gent, swearing, pesterer, oath, fella, curse word, bane, whammy, cuss, blasphemy, sacred, decent, bloke, curse, swearword, hex, jinx

Usage examples:

• But General Grant says in his 'Life' that he never used a profane expletive." - "Their Silver Wedding Journey", William Dean Howells.
• Association, which can do so much to influence and so little to regulate our dislikes, has insisted in linking this expletive with the classes that are taken to be the more sordid and malignant. - "A Cursory History of Swearing", Julian Sharman.
• 18. What pronoun is sometimes an expletive, and sometimes used with reference to an infinitive following it? - "The Grammar of English Grammars", Goold Brown.