だけど
だけど · dakedo · JLPT N3 · conjunction
however
だ (it is) + けど (but) = it is so, but… → however
だ is the plain copula meaning it is, and けど means but or although. Put together at the start of a sentence they mean that's true, but…, which is a casual however. The polite form is ですけど, and the fuller form is だけれども.