1. Hideously; horribly.

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

• monsterously,
• monstrousity,
• monstusly,
• nonstrously,
• konstrously,
• jonstrously,
• minstrously,
• mknstrously,
• mlnstrously,
• mpnstrously,
• m0nstrously,
• m9nstrously,
• monstruosly,
• monstruously,
• monserously,
• monstruousley,
• monstorously,
• monstrouslie,
• monserousley,
• Impostrously

• monastery,
• monestrous,
• moonstone,
• moon shot,
• monoestrous,
• monstrosity,
• menstrual,
• monstrous.

The adjective form of the word "monstrously" is "monstrous".