In an indeterminate manner.

Lack of determination; an unsettled or wavering state, as of the mind. / Lack of fixed or stated direction.

Not accurately determined or determinable. / Imprecise or vague.

(algebra, strict sense) A symbol that resembles a variable or parameter but is used purely formally and neither signifies nor is ever assigned a particular value; / (loose sense) a variable.

not accurately determined or determinable / imprecise or vague

(mathematics) A variable with no value assigned to it; for example the variables in a polynomial.

plural of indeterminate

(ethics, religion, uncountable) The doctrine that all human actions are not so much determined by the preceding events, conditions, causes or karma as by deliberate choice or free will.

in an indeterminable manner

That is incapable of being measured. / That is incapable of being ascertained.