undermine (v.)

• abate
• answer
• attenuate
• blunt
• confound
• confute
• contradict
• controvert
• cramp
• cripple
• crush
• damage
• damp
• dampen
• dash
• deaden
• debilitate
• defeat
• demolish
• deny
• devitalize
• disable
• dismiss
• drain
• dull
• enervate
• enfeeble
• eviscerate
• exhaust
• extenuate
• finish
• floor
• foil
• frustrate
• harm
• honeycomb
• hurt
• impair
• mine
• mitigate
• nonplus
• overthrow
• overturn
• overwhelm
• parry
• queer
• rattle
• rebut
• reduce
• refute
• ruin
• sabotage
• sap
• settle
• shake
• silence
• spoil
• squash
• squelch
• subvert
• threaten
• thwart
• unbrace
• undercut
• unman
• unnerve
• unstring
• upend
• upset
• weaken
• wreck