Undeclared rhymes with:
declared, declared, declared, blared, declared, flared, glared, laird, aird, aired, baird, bared, blared, cared, chaired, compared, dared, declared, despaired, ensnared, erred, fared, flared, glared, haired, impaired, laird, paired, pared, prepared, repaired, scared, shared, snared, spared, squared, stared, there'd, unimpaired, unprepared, where'd, zared