Words to Describe alternations

How alternations often is described ("________ alternations")

• regular
• vowel
• such
• accentual
• swift
• wonderful
• zero
• phonetic
• negative
• seasonal
• sudden
• climatic
• cyclical
• similar
• automatic
• consonantal
• grammatical
• morphophonemic
• various
• many
• synchronic
• several
• paradigmatic
• rhythmic
• sound
• productive
• allophonic
• systematic
• slow
• minor
• continual
• rapid
• lexical
• corresponding
• striking
• conditioned
• causative
• consonant
• initial
• phonemic
• usual
• constant
• abrupt
• vocalic
• irregular
• thin
• stress
• daily
• extreme
• periodic
• double
• endless
• periodical
• frequent
• positive
• occasional
• quick
• violent
• slight
• singular
• segmental
• following
• phonological
• perpetual
• syntactic
• numerous
• structural
• successive
• morphological
• curious
• tonal
• complete
• strange
• cyclic
• verbal
• sharp
• complex