Source: The Great Interpretation of Dreams (Ibn Sirin)
A widow in a dream indicates a deficient world. Marrying her indicates entering a deficient matter.
Source: Perfuming Humanity in the Expression of Dreams (Al-Nabulsi)
A widow indicates need and want. Whoever sees himself marrying her will be afflicted with poverty.
Source: Signs in the Science of Expressions (Ibn Shaheen)
A widow is interpreted as worry. Whoever sees himself speaking to her will be afflicted with worry.