sinuous
Having wavy indentation on its border or edge.
Roughly the same height for most of its length, becoming much shallower and then curving back towards the stem before reaching the attachment point.
To advance in wavy or curvy manner, to bend, to curve, to wind in and out
Indented.
Having on the margin a succession of curved segments or incisions.
Having a wave-like form or outline; undulating.