Sentence:  I recently played the following hand in a $2–$5 game in Las Vegas. I had a $1,000 stack. A <WSD>nitty</WSD> regular player opened from under the gun for $20 with a $1,000 stack. Another <WSD>nitty</WSD> player directly to my right called. This player had about $350 behind. 
Meaning of the word marked with <WSD> tags:  Of a poker player: playing in an overly cautious and reactive manner.