1. Marked by firm determination or resolution; not shakable
   - firm, steadfast, steady, stiff, unbendable, unshakable, unwavering, unshakeable

See also: resolute

• impolite
• impolitely
• impoliteness
• impolitic
• imponderable
• import
• import barrier
• import credit
• import duty
• importable
• importance
• important
• important person
• important-looking
• importantly
• importation
• imported
• importee
• importer
• importing
• importunate
• importunately
• importune
• importunity
• imposable