ironclad
adjective3 collocationsAvg. frequency: 5.8
a promise or assurance that is absolute and cannot be broken
a very strong alibi that cannot be disproved or argued against
a 19th-century warship protected by iron or steel plates
a promise or assurance that is absolute and cannot be broken
a very strong alibi that cannot be disproved or argued against
a 19th-century warship protected by iron or steel plates