Grace Qi on March 6, 2014
Technically according to the meaning of 不得劲儿(cannot fully utilize your energy; doesn't have enough strength...) It should be 得dé(to obtain). But 不得dei3劲 is more commonly used. It's 方言so that would depend on how you look at "standard". ;)

不得劲儿 has several meanings:







Here in this sentence 第4首很好听 但是男的唱高音还是有点不得劲

不得劲 is used to describe your student's feeling which is uncomfortable 不舒服, 不合适 - doesn't feel right, not appropriate. So here it's more like mentally 不舒服 or maybe physically - it depends on how your student reacted to that 男高音;)
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