奮闘
ふんとう · funtou · JLPT N1 · noun
conflict
奮 (fen) = exert + 闘 (tou) = fight: exerting yourself in a fight, so 'hard struggle' is the literal sense.
Both characters carry the idea: 奮 means to exert or rouse oneself, and 闘 means to fight or struggle. Together they describe straining hard against resistance.