"Attritional" is a term that is often used to describe a slow, grinding process that gradually wears down or reduces something over time. This term can be applied to a wide range of situations, from military operations to business strategies. Some synonyms for "attritional" might include words like gradual, slow, incremental, cumulative, or ongoing. Other similar words might include words like degenerative, erosive, undermining, exhausting, or draining. In general, these words all suggest a slow and steady decline or wearing-down of something, rather than a sudden or dramatic shift. When used correctly, synonyms like these can help to add nuance and precision to your writing or conversation.