To present participles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle;

not arranged in order

A character type with 2 states that have no plausible evolutionary sequence, e.g. the nucleotides A, C, G and T. A change between any pair of states is counted as 1 step. This is by far the most common type of character state used in cladistic analyses (cf. ordered, Dollo, irreversible).

list See bulleted list.