It's "resilience"

[inthesuburbs]

At least, it has been for a long time:

 

[Riptide]

The brilliancy there is remarkable.

 

[Southwinds]

Aggressiveness? No, it's aggression.

 

[mediaguy]

I think of aggressiveness and aggression as two distinct things.

Aggression vs. aggressiveness - Grammarist

 

[Baron Scicluna]

This thread is aggressively resilient

 

[Doc Holliday]

I prefer resilient.

 

[Riptide]

Resilientiveness demonstrates a higher level of sophisticationship, though.

 

[Cosmo]

It's sticktoitiveness.

 

[TyWebb]

These are all perfectly cromulent words.

 

[CD Boogie]

i'm nonplussed by this discussion...

 

[Big Circus]

These are all perfectly cromulent words.

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