1. Changeably.

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

• varitable,
• verably,
• variabes,
• variabilty,
• variablity,
• variabel,
• valiable,
• vaiable,
• variabels,
• varable,
• varible,
• variabe,
• variabl,
• varbally,
• ivariably,
• vvariable,
• variablle,
• varifiably,
• variiable,
• varivable

• variability,
• variable.

The adjective form of the word "variably" is "variable".

The plural form of the word "variably" is "variables"

The singular form of the word "variably" is "variable"