Synonyms for Vigorous

Synonyms starting with letter I

• intense

  energetic, strenuous
• indefatigable

  energetic
• industrious
• in good condition

  physically fit, robust
• invigorated
• in good shape

  robust
• in fine fettle
• in the pink

  go-getting
• impassioned
• incisive
• indomitable
• in good health

  robust
• intrepid
• intensive

  intense, strenuous
• impressive
• iron

  strong
• in-your-face

  all-out
• insistent
• impetuous
• invigorating
• inured
• inspiring
• influential
• important
• in shape

  physically fit
• in-depth
• in good trim

  robust
• immoderate
• intact
• in fine feather
• intent
• in full swing
• inexhaustible
• inventive
• ironclad
• in arms
• ingenious
• in condition

  physically fit
• immature
• irrepressible