For a general sense of sharpness:
* -ish: This suffix can be added to adjectives to make them less strong. For example, "sharpish" could describe something that is slightly sharp, but not very.
* -like: This suffix can be added to nouns to describe something resembling that noun. For example, "knife-like" could describe something having a sharp, cutting edge like a knife.
For specific types of sharpness:
* -edged: This suffix is used to describe something that has a sharp edge. For example, "double-edged" describes something with two sharp edges.
* -pointed: This suffix is used to describe something that has a sharp point. For example, "needle-pointed" describes something with a sharp, needle-like point.
For a metaphorical sense of sharpness:
* -witted: This suffix is used to describe someone who is quick and clever. For example, "sharp-witted" describes someone who is intelligent and can think quickly.
Ultimately, the best suffix to use depends on the specific meaning you want to convey.