serrated

Example:We need to replace the blunt knife with a new, sharp one for this task.

Definition:Made less sharp or dull, usually due to wear or sharpening.

Example:The smooth surface of the lake mirrored the sky perfectly.

Definition:Having no blemishes, flaws, or projections; flat or even, not rough or uneven.

Example:The rounded knife failed to make a clean cut through the tough vegetables.

Definition:Oblong and smooth, as if cut out of a rounded shape, or rounded off to form a circular shape; not sharpened, pointed, or chamfered.