Solicitor Thomas Byrne, who owes almost €57m to financial institutions, has been fined €1m and struck off the roll of solicitors.
The High Court made the orders upholding the recommendations of the Solicitors Disciplinary Tribunal last month.
The tribunal heard borrowings of almost €57m had been uncovered in Mr Byrne's accounts.
Mr Byrne's lawyer Seán Ó Síocháin said Mr Byrne had been beholden to one particular client and he asked the High Court to bear in mind that unlike another high profile solicitor, Michael Lynn, Mr Byrne had appeared before the court on every occasion.
But Mr Justice Richard Johnson said he would apply the full force of the tribunal's findings.
