Tebenna immutabilis is a moth of the Choreutidae family. It is known from the United States, including California. The wingspan is 15–17 mm. Head and thorax brownish, the latter marked with three longitudinal metallic lines. The forewings are broad. The basal fourth is brownish ocherous. The outer margin of the ocherous area is nearly straight and farther from the base on the costa. There are pinkish or bluish metallic subcostal and median longitudinal streaks. The outer three-fourths of the wing is uniformly clother with broadly white-tipped dark brownish fuscous scales. Sometimes, there is a faint golden tinge on the middle costa region. The outer half of the wing is marked with patches of metallic scales superimposed on velvety black, the most prominent being three in a row in the outer