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Webster 1913 Edition

adv.

In a variable manner.

adv.

Changeably; with alteration; in an inconstant or fickle manner.

variably ‎(comparative more variably, superlative most variably)

In a variable manner.
Such facts as the complex and extraordinary out growths which variably follow from the insertion of a minute drop of poison by a gall-producing insect, shows us what singular modifications might result in the case of plants from a chemical change in the nature of the sap. — Charles Darwin, The Origin of Species, Chapter 1.

in a variable manner