IPA: /ˈvaɪlɚ/
KK: /ˈvaɪlɚ/
More unpleasant, morally bad, or disgusting than something else.
His actions were viler than anyone could have imagined.
Comparative: viler
Superlative: vilest
Viler is derived from the adjective 'vile' (from Old French *vil*, meaning lowly or base) and the comparative suffix '-er' (meaning more). The word 'viler' means more vile or more base in nature.
Think of 'vile' meaning lowly or base, and remember that 'viler' means more of that quality.