jik sei lujvo

s₁=j₁ is aloof/alone/solitary/a hermit, separated from s₂=j₁.

In notes:

sepli: x₁ is apart/separate from x₂, separated by partition/wall/gap/interval/separating medium x₃.
pevyplu: x₁ is like an island in a sea of x₂; x₁ is very distinct/foreign (in appearance, composition and/or behavior) from surroundings/environment/background x₂.