Na-adjective (keiyodoshi), Noun
unskilled; clumsy; lousy; poor; awkward; shitty
Usually written using kana aloneDerogatory
ヘタクソな人は英訳しないでください。英訳依頼者からのお願いです。Please don't do translations if you're crap at it. This is a plea from the English translation clients.
Also written 下手糞【へたくそ】