1. In a detestable and infernal way.

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

• internaly,
• internallly,
• iunternally,
• interally,
• enternally,
• internall,
• inernally,
• internially,
• infernall,
• unfernally,
• jnfernally,
• knfernally,
• onfernally,
• 9nfernally,
• 8nfernally,
• ibfernally,
• imfernally,
• ijfernally,
• infernaly,
• inforoally

• inferential,
• inferior,
• in-person,
• inferno,
• inferiority,
• infernal,
• inebriated,
• in person,
• infertility,
• infertile,
• inebriant,
• informally,
• inebriate,
• internally,
• inoperable,
• in front.

The adjective form of the word "infernally" is "infernal".