IPA: /dɪˈstrʌktɪvnəs/
KK: /dɪˈstrʌktɪvnəs/
The condition of causing great damage or harm.
The destructiveness of the storm left the town in ruins.
Destructiveness → It is formed from "de-" (meaning down or away) and "struere" (meaning to build) combined with the suffix "-ness" (indicating a state or quality). The word describes the quality of causing destruction or the state of being destructive, as it implies taking away or breaking down what has been built.
Think of 'taking down' ('de-') what has been 'built' ('struere') — that's why destructiveness means the quality of causing destruction.