merely; nothing but; no more than
Expresses that something is merely or nothing more than what is stated, often downplaying its value or importance.
The pattern でしかない combines the copula で with the restrictive particle しか and the negative ない, literally meaning 'is not anything other than'. It emphasizes that the subject is just that and nothing more, often with a nuance of disappointment or belittlement. For example, saying それは夢でしかない means 'that is nothing but a dream', implying it's unrealistic or impossible. You can use it with concrete nouns or nominalized actions. In speech, it sounds a bit emphatic and can be used in both casual and formal contexts, but in writing it's common in essays or critiques.