1. In a harmfully insidious manner
   "these drugs act insidiously"
   - perniciously

See also: insidious

• swollen-headed
• swoon
• swooning
• swoop
• swoop up
• swoosh
• swop
• sword
• sword bean
• sword cane
• sword dance
• sword dancing
• sword fern
• sword grass
• sword knot
• sword lily
• sword of Damocles
• sword stick
• sword-cut
• sword-shaped
• swordbill
• swordfish
• swordlike
• swordplay
• swordsman