Have you never used a knife like this? I’ve got one that’s been used by people on plates enough that it’s dull - I can press it into my fingers and pull back and forth and it won’t cut me with pretty reasonable pressure. With more pressure if it’s a glancing thing it’ll not take off a knuckle. I’ve just used it so that I could say this but chopping up a cucumber is totally fine and easy. I can’t cut like I can with my actually sharp knife but it’ll cut stuff.