undiverse

Lacking in variety

Undiverse describes a lack of variety or diversity, typically in composition or membership: The company's leadership remains stubbornly undiverse.

The word appears most often in discussions of demographic representation—race, gender, background—where homogeneity is viewed as a problem to be addressed.

Less common than its opposite.

sameness

homogeneous

Alike in composition throughout

indistinguishable · monolithic · unvaried · standardized · conformist · cookie-cutter · carbon-copy · clone · matching · interchangeable

monotony

monotonous

Unchangingly dull

dull · bland · colorless · flat · featureless · undifferentiated · samey · predictable · stale · lifeless

Opposites
variety and heterogeneity

undiversediverse

Of many types

varied · heterogeneous · multifarious · eclectic · mixed

Family

undiverted, undiversified

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G