1. Characterized by an absence of force or forcefulness
   - undynamic 
2. Lacking strength or vigour
   - asthenic, debilitated, enervated

See also: backward, moribund, stagnant, weak

• undertake
• undertaker
• undertaking
• underthings
• undertide
• undertone
• undertow
• undervaluation
• undervalue
• undervest
• underwater
• underwater archaeology
• underwater archeology
• underwater diver
• underway
• underwear
• underweight
• underwhelm
• underwing
• underwood
• underworld
• underwrite
• underwriter
• undescended
• undescended testicle