IPA: /ʌnˈʃɑrp/
KK: /ʌnʃɑrp/
Not having a clear or defined edge; lacking sharpness or clarity.
The image was unsharp, making it difficult to see the details clearly.
Unsharp → It is formed from "un-" (meaning not) and "sharp" (from Old English "scearp", meaning having a fine edge or point). The word "unsharp" means not sharp or lacking a fine edge.
Think of 'not' ('un-') and 'having a fine edge' ('sharp') — that's why unsharp means lacking sharpness.