only; just (negative description)
Describes a situation where only one action or state occurs, implying a negative evaluation or lack of something else.
This pattern is used to say that someone does nothing but a certain action, or that a situation is characterized only by one thing, and it often carries a sense of criticism or disappointment. It emphasizes that there is no variety or no positive outcome. The で is the te-form of だ, so it can be followed by other clauses, but it is also used at the end of a sentence to imply 'and nothing else.'
For example, if someone is always complaining, you might say '文句を言うばかりで、何もしない' meaning they only complain and do nothing. It is common in spoken Japanese but can also appear in writing. Note that it is different from ばかりに, which means 'just because of' and has a different nuance.