The word "arm-twisted" is often used in the sense of persuading or coercing someone to do something against their will. Some antonyms for this word would be "convinced," "persuaded," or "encouraged." These words imply that someone has been swayed by logical arguments or appeals to their emotions and feels positively about the action they are undertaking. Other antonyms might include "voluntarily," "willingly," or "enthusiastically," which suggest that the person in question is actively choosing to participate in the activity and is eager to do so. Overall, these antonyms paint a much more positive picture of human interaction than the negative connotations of "arm-twisted.