"Loathsome" is so spelled, even though the first syllable sounds like the verb (rhymes with "clothe") rather than the adjective (rhymes with "oath"). Perhaps as a result of the sound association, many writers err by writing "loathsome" -- e.g.:
o "An array of loathesome [read 'loathsome'] characters drifts through this anthropology of the urban undead." Chris Kidler, "Tama Janowitz's 'A Certain Age,'" Baltimore Sun, 8 Aug. 1999.
o "Severed Fingers and Toes (Gasworks) are extremely loathesome [read 'loathsome']-looking gummy chews, available at party stores." Charles Perry, "Extreme Treats," L.A. Times, 27 Oct. 1999.
o "The characters we first meet in 'Nurse Betty' are terminally dim, risible or loathesome [read 'loathsome']." James Verniere, "Zellweger Is a Reason to Love 'Nurse Betty,'" Boston Herald, 8 Sept. 2000.