opposed/opposing

against the grain allergic anti antipathetic antithetical antonymous at cross-purposes at odds averse battling clashing combating conflicting confronting contrary controverting counter crossing defending defensive denying disagreeing disputed disputing dissentient enemy exposing facing gainsaying hostile in opposition incompatible inimical irreconcilable objecting obstructive opposite protesting repelling restrictive rival up against warring

aiding assisting compatible helping similar