Negative prefixed in English include, a-; anti-; de-; dis-; i(r)- i(l)- in- im-; non- and un-, some of which have more specific meanings. These are generally used with single-word modifiers, i.e. adjective and adverbs.
- i(r)-, i(l)-, in- and im- are the same morpheme spelt differently, with minor pronunciation and spelling changes:
- i(r)- is bound towords starting with R, and the R is then doubled, e.g. religious -> irreligious
- i(l) - is bound to words beginning with L, and the L is doubled, e.g. logical -> illogical.
- i(m) - is bound to words beginning with M, and the M is doubled, e.g. moral -> immoral.
- im- is bound to words beginning with P, e.g. possible -> impossible
- in- is bound to words beginning with a A, E, O or a consonant except L, M, P, R, e.g. accessible -> inaccessible, eligible -> ineligible, organic -> inorganic; and then competent -> incompetent, decent -> indecent, frequent -> infrequent, glorious -> inglorious, hospitable - > inhospitable, judicial -> injudicial, K?, *L *M noxious -> innoxious, Q?, sane -> insane, tolerant -> intolerant, U*, violable - > inviolable, *W, *X, *Y, *Z.
- Un- is highly productive, so most newly-coined words take this.