Megandi

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

megandi

pr. p. availing, mighty, strong; fylldi hann þat heit, er hann var m. maðr, as soon as he grew to be man of might; lítt m., feeble, weak; ekki m., powerless, helpless.

Possible runic inscription in Younger Futhark:ᛘᛁᚴᛅᚾᛏᛁ