Zero
ity + t
There are 6 morphemes in "irresponsibility": in-, respons-, -ibil-, -ity.
Desirability has four morphemes: desire-able-ity.
Ice Ice Baby
ITY = Interlock Twist Yarn - knit jersey fabric
There isn't a Moshling called spok-ity on Moshi Monsters which you can attract.
The answer is "ity" or "ation".
680 miles
i made ity
Ity
Some words that end in -ity are: morality, integrity, atrocity, authority, capability, mutuality
-ity