voden

1. water; aquatic
   Vodena para se diže iz lonca. — Water vapour is rising from the pot.
   Deca obožavaju vodene sportove na moru. — The kids love water sports at the seaside.
2. (of food or drink) watery; diluted
   Ova supa je baš vodena i bez ukusa. — This soup is really watery and tasteless.
3. (of a text or speech) weak; vapid
   Njegov govor je bio dug i voden. — His speech was long and vapid.

In the sense 'water, aquatic' the definite form vodeni, vodena, vodeno is usually used.