1. Marked by firm determination or resolution; not shakable
   "a man of unbendable perseverence"
   - firm, steadfast, steady, stiff, unfaltering, unshakable, unwavering, unshakeable

See also: resolute

• eponymous
• eponymy
• epos
• epoxy
• epoxy glue
• epoxy resin
• EPROM
• EPS
• epsilon
• Epsilon Aurigae
• epsilon toxin
• Epsom salts
• Epstein
• Epstein-Barr virus
• eptatretus
• Eptesicus
• Eptesicus fuscus
• Eptesicus serotinus
• epyllion
• eq
• equability
• equable
• equably
• Equador laurel
• equal