The act is unjustifiable that either begs for a blessing, or, having succeeded gives no thanksgiving.

Colorful garments - ball gowns, kimonos, evening pajamas - made from yards upon yards of iridescent silk or velvet. I own an unjustifiable number of such outfits and jump at the chance to wear them. Against the etiquette about which I am otherwise all too conscious, I frequently, and unrepentantly, overdress for the occasion.

From the beginning men used God to justify the unjustifiable.

De jure objections are arguments of claims to the effect that Christian belief, whether or not true, is at any rate unjustifiable, or rationally unjustified, or irrational, or not intellectually respectable, or contrary to sound morality, or without sufficient evidence, or in some other way rationally unacceptable, not up to snuff from an intellectual point of view.

The act is unjustifiable that either begs for a blessing or having succeeded gives no thanksgiving.

The education cuts in the President's budget are both irresponsible and morally unjustifiable.