loath in WordNet English dictionary

1. (usually followed by `to') strongly opposed
   "antipathetic to new ideas"; "averse to taking risks"; "loath to go on such short notice"; "clearly indisposed to grant their request"
   antipathetic  antipathetical  averse  indisposed  loath  loth 
   
2. unwillingness to do something contrary to your custom
   "a reluctant smile"; "loath to admit a mistake"
   loath  loth  reluctant