1. criminal or wrongdoer.   malingerer   malefactor   forebears   lexicographer   Hint Half-n-half Clue   2. irritating person; cattle-biting fly.   ingrate   hypochondriac   vagabond   gadfly   Half-n-half Clue   3. person who is ungrateful.   ingrate   dupe   virago   lout   Half-n-half Clue   4. one who intrudes into others' affairs (for profit).   interloper   etymologist   malefactor   introvert   Half-n-half Clue   5. person who studies fishes.   killjoy   despot   ichthyologist   ethnologist   Half-n-half Clue   6. clumsy or rough-mannered person.   lout   glutton   gourmet   fancier   Half-n-half Clue   7. person who causes trouble and starts quarrels.   oaf   firebrand   hireling   fancier   Half-n-half Clue