1. In a filthy manner.

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

• filthly,
• fithly,
• fifthly,
• firthly,
• dilthily,
• cilthily,
• vilthily,
• gilthily,
• tilthily,
• rilthily,
• fulthily,
• filthiy,
• filthliy,
• filthiily,
• filthilly,
• walthily,
• felthily,
• felthly,
• firthily,
• Fulttilt

• foothill,
• filth,
• filthier,
• filthy.

The adjective form of "filthily" is "filthy".

The plural form of "filthily" is the same as the singular form, as it is an adverb and does not change in number.

The singular form of the word "filthily" is "filthy"