unbreakable adjective 3noun 1forms 3 adjective3 •Difficult or impossible to break and therefore able to withstand rough usage.His 14 singles titles still look like a typo even for those like me who have watched him build that probably unbreakable record, red brick by red brick. — 2023 •(figurative) Resilient. •Not able to be broken in. noun1 •Something that cannot be broken. formsunbreakables · more unbreakable · most unbreakable