1. Slyly and secretly
   "old line aristocratic diplomats underhandedly undermined the attempt...to align Germany with the Western democracies"
   - underhand

See also: underhand

• unpillared
• unpin
• unpitying
• unplaced
• unplanned
• unplanted
• unplastered
• unplayable
• unplayful
• unpleasant
• unpleasant person
• unpleasant woman
• unpleasant-smelling
• unpleasantly
• unpleasantness
• unpleasing
• unpleasingness
• unpledged
• unploughed
• unplowed
• unplug
• unplumbed
• unpointed
• unpointedness
• unpolished