IPA: /ˈspaɪkɪnəs/
KK: /ˈspaɪkɪnəs/
The quality or state of having sharp points or spikes.
The spikiness of the cactus makes it difficult to handle.
Spikiness is formed from "spike" (from Old English "spica", meaning a sharp point or thorn) and "-ness" (meaning the state or quality of). The word describes the quality of being spiky or having sharp points.
Think of a 'spike' as a sharp point, and remember that 'spikiness' refers to the quality of having many sharp points.