iron-clad guarantee
- warrantyFormal repair promise
- promiseCommitment to act
- assuranceFirm promise or certainty
- bulletproofResistant to gunfire
- unbreakableImpossible to damage
contract · seal · bond · sworn · locked · airtight · watertight · solid · steel · armor · binding · oath · pledge · certified · absolute · foolproof · secure · vow
certainty/reliability
iron-clad guaranteeempty promise
Pledge without intent
hollow promise · uncertainty · gamble · crapshoot · maybe
commitment strength
iron-clad guaranteeescape clause
Contract provision permitting withdrawal
soft commitment · no strings attached · gentleman's agreement · weasel words · handshake deal