Suppression must be of Material Fact

“12. It is trite law that so as to enable the court to refuse to exercise its discretionary jurisdiction suppression must be of material fact. What would be a material fact, suppression whereof would disentitle the appellant to obtain a discretionary relief, would depend upon the facts and circumstances of each case. Material fact would mean material for the purpose of determination of the lis, the logical corollary whereof would be that whether the same was material for grant or denial of the relief. If the fact suppressed is not material for determination of the lis between the parties, the court may not refuse to exercise its discretionary jurisdiction. It is also trite that a person invoking the discretionary jurisdiction of the court cannot be allowed to approach it with a pair of dirty hands. But even if the said dirt is removed and the hands become clean, whether the relief would still be denied is the question.

Supreme Court
Arunima Baruah vs Union of India and Others (2007) 6 SCC 120