parenthetic (adj.)
- accidental
- adrift
- broken
- casual
- choppy
- disconnected
- discontinued
- discontinuous
- discrete
- disjunctive
- episodic
- extraneous
- extrinsic
- fitful
- immaterial
- impertinent
- inadmissible
- inapplicable
- inapposite
- inappropriate
- incidental
- incoherent
- inconsequent
- intercalary
- intermittent
- interrupted
- irregular
- irrelevant
- jagged
- jerky
- noncontinuous
- nonessential
- nonlinear
- nonuniform
- occasional
- out-of-the-way
- parenthetical
- patchy
- scrappy
- spasmodic
- spotty
- suspended
- unconnected
- unessential