けれど; けれども
けれど; けれども · keredo; keredomo · JLPT N4 · noun
but
keredo = care-a-dough: I care, BUT I have no dough
Keredo sounds like care-a-dough: I care, but there is no dough. Adding mo (keredomo) makes it more formal; dropping to kedo makes it casual. It joins two clauses that pull against each other, like but or although.