1 adjective in ruinsina fhothrachina bhallógtite as a chéilethe house was deserted and ruinousbhí an teach tréigthe agus ina fhothrach2 adjective destructivedíobhálach adj1 c m udochrach adj1 c m uit can be ruinous to your healthis féidir leis an-dochar a dhéanamh do do shláinte3 adjective financiallyit's a venture that could prove ruinous to themfiontar is ea é a d'fhéadfadh iad a chreachadh