overdeepened
/ˌəʊvəˈdiːp(ə)nd/Chiefly Physical Geography
adjective
1Of a valley: eroded more deeply by glacial action than would occur by water erosion alone.
2More generally: made excessively or abnormally deep; especially further deepened by erosion.
Origin
Early 20th century; earliest use found in Science. From over- + deepen + -ed.