Expletive1. (a.) Filling up; hence, added merely for the purpose of filling up; superfluous.
2. (n.) A word, letter, or syllable not necessary to the sense, but inserted to fill a vacancy; an oath.
Thesaurus Entries
battology, bedizenment, blurt, curse, cuss, cuss word, de trop, dirty name, dirty word, dispensable, duplication, duplication of effort, dysphemism, ecphonesis, ejaculation, embellishment, epithet, excess, exclamation, expendable, extravagance, fat, featherbedding, filler, filling, foul invective, frill, frills, frippery, gingerbread, gratuitous, in excess, iterative, luxury, macrology, naughty word, needless, needlessness, no-no, nonessential, oath, obscenity, ornamentation, outburst, overadornment, overlap, padding, payroll padding, pleonasm, pleonastic, profane oath, prolix, prolixity, redundance, redundancy, redundant, reiterative, repetitious, spare, stammering, stuttering, supererogatory, superfluity, superfluous, superfluousness, swear, swearword, tautologic, tautological, tautologism, tautologous, tautology, to spare, uncalled-for, unessential, unnecessariness, unnecessary, unneeded, verbose, verbosity, wordy