GREENBURGH, N.Y. - J.R. Smith's wallet is $50,000 lighter and it sounds like Mike Woodson's patience with the exasperating shooting guard is at an all-time low.

After Smith didn't heed the NBA's warning for untying an opponent's sneaker, the league fined him yesterday $50,000 "for recurring instances of unsportsmanlike conduct." Woodson called Smith's antics "unprofessional" and "unacceptable" and said "it's got to stop."

The NBA warned Smith after he untied Shawn Marion's sneaker while one of his Mavericks teammates shot a free throw on Sunday. But Smith tried untying Detroit's Greg Monroe's sneaker on Tuesday night at the Garden with NBA president of basketball operations Rod Thorn in attendance.

Smith wasn't available for comment yesterday but was remorseful on Twitter: "Huge apologies to my team, to the league an most of all you the fans!"

Woodson, who has tried to help Smith be more professional, clearly was upset. Woodson said before the Pistons game he would speak to Smith about the Dallas incident. Apparently Smith didn't listen to the league or his coach.

"I'm not happy about this," Woodson said on ESPN radio Wednesday. "He was warned. He comes back and he makes the same mistake, and it's not right. I'm going to address it [Thursday] when he comes in here for work, because it's unacceptable. It really is. It's unprofessional. You just can't do that. You just cannot do it."

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Since signing with the Knicks in 2012, Smith has been fined $105,000 by the NBA and has been suspended twice.

Smith, whom the Knicks re-signed to a three-year, $17.9-million deal in July, was fined $25,000 in November "for directing hostile and inappropriate language" to Pistons guard Brandon Jennings via his Twitter account. Smith was defending his brother Chris after Jennings questioned whether he belonged in the NBA. Chris Smith has since been waived by the Knicks.

J.R. Smith also was suspended the first five games of the season for failing a drug test.

"There's no question he's done a lot of things this year that has put him in a bad position and our team in a bad position," Woodson said. "Somehow we've got to clean that up . . . This is unacceptable. It's just got to stop. I keep saying this every time something pops up, but it's got to stop."

Smith is not helping the Knicks with his play either. Last year's Sixth Man of the Year is shooting only 34.8 percent and averaging 11.3 points. In Friday's two-point loss in Houston, Smith didn't know the game was tied and hoisted a rushed three-pointer instead of holding for a last shot.

In last year's playoffs, Smith was suspended one game for throwing an elbow at former Celtics guard Jason Terry and fined $5,000 for a flopping violation against Indiana. In 2012, Smith was fined $25,000 for posting an inappropriate photo on Twitter.

Woodson wouldn't say whether Smith would face any punishment from the Knicks or have his playing time cut after the latest misstep.

"He's got to grow up," Woodson said. "And how come it can't come from J.R. Smith? And that's kind of how I look at it. After a while, these things have got to stop. It's just got to stop."