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

• step
• step by step
• step dancing
• step forward
• step on
• step on it
• step out
• step rocket
• step stool
• step to the fore
• step-down
• step-down transformer
• step-in
• step-up
• step-up transformer
• party spirit
• party to the action
• party to the transaction
• party wall
• party whip
• party-spirited
• partygoer
• Parula
• Parula americana
• parula warbler