Synonyms for Extensive

Synonyms starting with letter I

• inclusive

  specific, widespread, comprehensive
• immense

  size, large, huge
• infinite

  boundless
• indiscriminate

  far-reaching
• immeasurable

  large
• in-depth
• interminable
• important
• illimitable
• international
• inescapable
• intensive
• impressive
• incalculable
• inestimable
• inexhaustible
• imposing
• itemized
• integral
• indefinite
• intercontinental
• innumerable
• immensurable
• influential
• imperative
• importunate
• inordinate
• imperceptive
• in depth
• illustrious
• intense
• irresistible
• in use
• in bulk
• in quantity
• in the mass
• including all categories
• including all members
• indeterminate
• intricate