-I would harden
The word endurecería is the conditional form of endurecer in the first person singular. There are other translations for this conjugation.
See the full endurecer conjugation


Para la aceptación de las compensaciones, se endurecería la exigencia de procedimientos de licitación.
For the acceptance of compensation, the requirements for tendering procedures will be toughened up.
Se trata de una realidad mayor que una simple repartición diferente de los bienes, que se limitaría al campo material y más bien endurecería los corazones.
This is a greater reality than merely a different distribution of possessions, which would still be in the material domain and thereby make hearts even harder.
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