Answer:
1. Flooding is a PERENNIAL problem for people living by the river.
2. The. CONGENIAL apartment had many dead rats and messy rooms.
3. We watched a movie about the DISSIPATION of a famous hair's fortune.
4. The town is an UNTENABLE place for raising children.
5. My sister had a PERTURBATION after the death of her son.
6. My friends discovered an UNFATHOMED child in the forest.