"Turn one's hand to" is an expression that refers to someone's skill or ability to do something with ease. Antonyms, on the other hand, are words that have opposite meanings. Therefore, antonyms for "turn one's hand to" are words that denote a lack of ability or incompetence. These words can include phrases like "inability," "impossibility," "incapability," or "unskillfulness." Antonyms can also be individual words such as "inept," "ineffective," "incompetent," or "clumsy." All of these words describe the opposite of someone who can turn their hand to something and do it well.