1. Imparting vitality and energy
   - bracing, brisk, fresh, refreshing, tonic

See also: invigorating

• improvised
• improvised explosive device
• improviser
• improvize
• imprudence
• imprudent
• imprudently
• impudence
• impudent
• impudently
• impudicity
• impugn
• impugnable
• impugner
• impuissance
• impuissant
• impulse
• impulse explosive
• impulse turbine
• impulse-buy
• impulsion
• impulsive
• impulsively
• impulsiveness
• impunity