Synonyms for Pertinacious

Synonyms starting with letter I

• inflexible

  determined, unyielding, bullheaded
• insistent

  determined, obstinate, stubborn
• intractable

  determined, stubborn, tenacious
• intransigent

  determined
• indefatigable

  determined
• importunate
• immovable
• implacable
• indomitable

  stubborn
• incompliant
• inexorable
• iron
• industrious
• inexhaustible
• invincible
• indurate
• interminable
• incessant
• insubordinate
• inconvincible
• intent
• ill-natured
• immalleable
• impliable
• in for long haul
• incurable
• insoluble
• indocile
• impractical
• ironclad
• indifferent
• imperative
• instant
• impregnable
• invulnerable
• impassable
• insuperable
• insurmountable
• iron-willed
• intense