Source: The Great Interpretation of Dreams (Ibn Sirin)
Praying without ablution indicates non-acceptance of deeds or striving for a false matter that will not be completed.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
Praying without ablution indicates illness or loss in trade.
Source: Signs in the Science of Expressions (Ibn Shaheen)
Praying without ablution is interpreted as worry and loss.