An adjective for “slain” derived from primitive ✶dankĭnā (PE17/133), best known from its (mutated plural) appearance in the name Haudh-en-Ndengin “Hill of Slain” (S/197). N. dangen “slain” also appeared in The Etymologies of the 1930s under the root ᴹ√NDAK “slay” (Ety/NDAK). This adjective is likely the passive participle of the verb dag- “to slay”.
Conceptual Development: A similar adjective ᴱN. danc “killed in battle” appeared in the Early Qenya Phonology of the 1920s, also related to ᴱN. dag- “slay” (PE14/66).
A verb for “undo” appearing in notes from around 1959 as a combination of dan “back again” and car- “do” (PE17/166).