"a faulty technique" is a correct and usable phrase in written English. It can be used when describing any technique that has failed or is flawed in some way. For example: "The research team found that their experimental technique was faulty, which meant that the results were inaccurate.".
Then he demonstrated a faulty technique that I recognized, with silent embarrassment, as my own.
Lyth did get a snorter from Starc but is no more looking the long-term answer as Cook's opening partner than his predecessors since Andrew Strauss retired while Gary Ballance is hamstrung by a faulty technique that has been rumbled.
Armstrong, like many self-taught geniuses, had a faulty technique, and, by the forties, the scar tissue — alarmingly visible in a closeup shot at the end of the 1956 film "High Society" — was such that rapid-fire cascades of notes no longer came as easily.
He could be a reactionary and a bit of a moaner, often unable to hide his displeasure at a faulty bowling technique, though praise was also willingly given.
The occurrence of any unwanted bumps or unevenness is a risk of any filler agent and is usually due to faulty technique.
But this faulty technique fails to account for the fact that both the cue ball and the object ball are 2 1/4 inches in diameter, and that the selected aim spot on the object ball must be struck half a diameter, or 1 1/8 inches, from the center of the cue ball.
As painting materials became more readily available in commercial preparations in the 18th and 19th centuries, systematic methods of painting that were once passed from master to apprentice were replaced by greater individual experimentation, which in some cases led to faulty technique.
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MA of Applied Linguistic, Maquarie University, Australia