1. So as not to be definable.

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

• indefenatly,
• indefinitly,
• indefinately,
• indefiniely,
• indefinetly,
• indefinantly,
• indefinatly,
• indefintely,
• indefintly,
• indifinable,
• indefinatley,
• undeinably,
• indeffinatly,
• indefanatly,
• indenfinatly,
• indefinible,
• indefinaty,
• indecimably,
• indecinbly,
• indefinsably

The adjective form of the word "indefinably" is "indefinable".

The plural form of the word "Indefinably" is "indefinables".

The singular form of the word "Indefinably" is "Indefinable"