Adjectives derived form trapezium and trapezoid

Could anyone help me to find the right words to describe trapezium and trapezoid shape? I know that British English defines two ideas, i.e. trapezium (a quadrilateral with two parallel sides) and trapezoid (a quadrilateral with no parallel sides). What are the adjectives relevant to the both nouns? How about 'trapezial' and 'trapezoidal'?