Lawyers for IBRC have claimed Sean Quinn had the motive, opportunity and capacity to breach a court order directing him not to dispose of international assets.
In the closing stages of High Court proceedings, the bank's legal team said the bankrupt businessman's evidence was at times "incredible and fantastic".
Lawyers for IBRC, formerly Anglo Irish Bank, point to what they say is a "labyrinthine pattern of deception" in the dispersal of Quinn assets.
The former billionaire, his son Sean Quinn Jr and his nephew Peter Darragh Quinn deny the bank's claims that they breached court orders from last summer.
The injunctions were put in place to stop the Quinns disposing of assets in countries such as Russia and the Ukraine which the bank is trying to secure as collateral against debts of €2.8bn.
In final submissions to the court, senior counsel for IBRC Shane Murphy pointed to Sean Quinn's anger and resentment towards the bank and said it was "quite clear the motive to thwart the bank is absolutely established".
He invited the court to consider the credibility of Mr Quinn's evidence that he initiated a plan to move assets beyond Anglo's reach but took no further steps after April last year.