Hrymjast

As defined by A Concise Dictionary of Old Icelandic (Geir Zoëga):

hrymjast

(d), v. refl. to become old and infirm; hrymdr, infirm from age (h. bæði at sýn ok elli).

Possible runic inscription in Younger Futhark:ᚼᚱᚢᛘᛁᛅᛋᛏ