1. In a protracted manner.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• orotractedly,
• lrotractedly,
• -rotractedly,
• 0rotractedly,
• peotractedly,
• pdotractedly,
• pfotractedly,
• ptotractedly,
• p5otractedly,
• p4otractedly,
• pritractedly,
• prottractedly,
• protactedly,
• protrctedly,
• proctractedly,
• pratractedly,
• protractitedly,
• protractiedly,
• protractledly,
• protractdelly

• preternaturally,
• protraction,
• protoarcheology,
• protractile,
• protractor,
• pretorial,
• preternatural,
• preterite,
• protracted,
• protractible.

The adjective form of the word "protractedly" is "protracted".

The plural form of "protractedly" is still "protractedly" as it is an adverb and does not have a distinct plural form.

The singular form of the word "protractedly" is "protractedly".