Circumstantial rhymes with:
insubstantial, substantial, insubstantial, substantial, insubstantial, substantial, consequential, credential, deferential, existential, exponential, hentschel, inconsequential, influential, insubstantial, konczal, nonessential, preferential, presidential, providential, prudential, residential, reverential, sequential, substantial, tangential, torrential, vice-presidential, winchell