1) Arched 2) Arching 3) Arciform 4) Arcuate 5) Bent 6) Bent like a rainbow 7) Bow-shaped 8) Bowed 9) Bowshaped 10) Curve-shaped 11) Curved 12) Curved like a rainbow 13) Curved over 14) Curvilinear 15) Curving 16) Curvy 17) Described a parabola 18) Discharged with sparks 19) Emulated a pendulum 20) Flew like a birdie 1) Arching 2) Arciform 3) Arcuate 4) Curved 5) Curving 
[adj] - (architecture) forming or resembling an arch
arcing, arced 1. To form an arc. 2. To move or seem to move in a curved path: 'We observed the rainbow arcing across the sky.'
arched adjective forming or resembling an arch; `an arched ceiling`