English Vocabulary Flash Cards @ englishpdf.com and englishteststore.com File 296 indigestible (adj) Not digestible, or difficult to digest indigestion (n) Difficulty or failure in the alimentary canal in changing food into absorptive nutriment indignant (adj) Having such anger and scorn as is aroused by meanness or wickedness indignity (n) Unmerited contemptuous conduct or treatment indiscernible (adj) Not perceptible indiscreet (adj) Lacking wise judgment indiscriminate (adj) Promiscuous indispensable (adj) Necessary or requisite for the purpose