Try a Kaweco or Lamy medium nib with a Kaweco or Lamy blue ink. It doesn't write bold. Same can be said with Lamy nib + Lamy black ink.
Medium can mean a lot of things. My Parker Vector's medium nib with Parker's own ink is equal to broad on many other manufacturers. Kaweco's medium is almost equal to Lamy's fine.
All nibs become quite comfortable after they are shaped by your hand and writing :)