Turbid usually describes something cloudy, muddy, or unclear. It often refers to water, but it can also describe ideas or explanations that are hard to see through clearly. If a river is full of sediment after rain, the water may look turbid.
Turgid means swollen, distended, or overly inflated. In everyday language, it often describes writing or speech that feels pompous, heavy, or overly ornate. A turgid paragraph uses too many grand words and becomes difficult to read.
The easiest way to separate them is this: turbid is about murkiness, while turgid is about bloating. One suggests lack of clarity, the other suggests excess.
- Turbid: The pond turned turbid after the storm.
- Turgid: His speech grew turgid and hard to follow.
If you are describing water, air, or meaning that seems cloudy, choose turbid. If you are describing language, style, or even a swollen condition that feels overfilled, choose turgid.