Like Beckett, and Ingeborg Bachmann, and Celan: writers that seem to be unable to make adequate use of language (deliberately) for they feel it cannot express that particular thing they want to, like in Beckett's poem, ''What is the word''.
Perhaps writers that had been influenced by Wittgenstein?
Anyway, writers that don't believe in words' conventional meaning, and thus treat them accordingly. Do you know any?