1. In a questionable manner.

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

• qustionable,
• questionaly,
• questionabe,
• quesionable,
• guestionable,
• questionble,
• questinable,
• quesetionable,
• questionalble,
• questionly,
• questiongly,
• questionabley,
• questioneble,
• quetionable,
• questioable,
• questionnable,
• questional,
• questionabel,
• questonable,
• questionale

• question mark,
• questioning,
• questioner,
• questionable,
• questioningly,
• question master,
• question of law,
• question sheet,
• questionnaire,
• question time.

The adjective form of "questionably" is "questionable".

The plural form of the word "questionably" is "questionably". The word remains the same in both singular and plural forms.

The singular form of the word "questionably" is "questionable"