Head coach Andy Robinson lamented Scotland's error-strewn display as Wales ended their eight-Test winless streak with a 24-6 victory at Murrayfield.
For the fourth successive occasion Scotland suffered defeat in an RBS 6 Nations encounter with Wales, leaving them with two defeats from two matches and alongside Italy at the foot of the championship table.
"We made too many errors, particularly in that first 20 minutes," said Robinson,
"If you make errors like that and give Wales the opportunities that we gave them... they grew in confidence, they grew in their physicality and ended up deserved winners.
"The guys are hurting pretty hard. Everybody's disappointed. That is unacceptable, what happened."
Despite the victory ending his side's winless run, Wales coach Warren Gatland felt his side had produced a better display in last weekend's defeat by England in Cardiff, but praised them for coping well with the pressure they were under.
He said: "I thought we played better last week, we played really well, we were a bit unlucky. If you look at the two sides last week England came away as fantastic and we were rubbish. But if you looked at the stats they showed it was a very tight game.
"I thought we were clinical, defended exceptionally well and thoroughly deserved to win. The boys fronted up and that's what it's about in sport at the highest level.
"Whether you are a player or a coach you will come under pressure and it's about showing character and responding to that and that what makes a man, people who love the challenge of having your backs to the wall.
"I thought the players could have easily lacked confidence as they have been under the pump but they continued to work really hard and front up. The performance needs to improve but the result was good."