An adjective for “yawning” appearing in the Markirya poem of the 1960s, probably an active participle of an otherwise unattested verb hac- or háca- “yawn” (MC/222).
Conceptual Development: In the version of the Markirya poem from around 1930, Tolkien used ᴱQ. yáme “yawning” (MC/214), replacing yape from the drafts of the poem (PE16/81).
hácala _("k") _participle "yawning" occurring in the Markirya poem, derived from an (otherwise unattested) verb #hac- "yawn". Compare yanga-.