A person's "technique" means how correctly they perform a physical skill. You can use this phrase to talk about a wide variety of skills like:

• throwing a ball
• shooting a gun
• swimming
• playing a piano

You can use a variety of adjectives to talk about a person's technique:

Her technique is almost perfect.

His technique is poor.

One common adjective is "sloppy". "Sloppy" means dirty or unorganized. A person with "sloppy" technique doesn't perform the skill in the correct way. They may do it a little differently each time.