形容词

1. 语无伦次的;(言语)不连贯的,混乱的
    If someone is incoherent, they are talking in a confused and unclear way.

1. unable to express yourself clearly or fluently

    e.g. felt tongue-tied with embarrassment
           incoherent with grief

    Synonym: tongue-tied

2. (physics) of waves having no stable definite or stable phase relation

3. without logical or meaningful connection

    e.g. a turgid incoherent presentation