undifferentiable

Impossible to separate

Undifferentiable describes something that cannot be distinguished from something else—two things so alike that no meaningful difference can be identified between them: The knockoff was undifferentiable from the original.

In calculus, undifferentiable describes a function that lacks a derivative at a given point, typically where the curve has a sharp corner or discontinuity.

abstract

indistinguishable

Impossible to tell apart

vague · ambiguous · undefined · blurry · fuzzy · unclear · homogeneous · uniform · featureless · nondescript

calculus

derivative

Function's rate of change

corner · tangent · piecewise · absolute value · sharp turn · kink · step function · fractal · pathological · sawtooth

philosophical

ontology

Study of existence's nature

otherness · distinction · category · classification · boundary · demarcation · taxonomy · dichotomy · binary · spectrum

Opposites
mathematical differentiability

undifferentiabledifferentiable

Having a derivative

smooth · analytic · regular · well-behaved

distinguishability

undifferentiabledifferentiable

Having a derivative

distinguishable · distinct · discernible · unique · identifiable

Family

undifferentiated, differentiate, differentiated, differentiating, differentiation, differentiable, different, differently, differ

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Used worldwide · Timeless · Abstract · Rated G