Valmiki Ramayana 5.27.27
दुर्गन्धं दुस्सहं घोरं तिमिरं नरकोपमम् ।मलपङ्कं प्रविश्याशु मग्नस्तत्र स रावणः॥
durgandhaṃ dussahaṃ ghoraṃ timiraṃ narakopamam |malapaṅkaṃ praviśyāśu magnastatra sa rāvaṇaḥ ||
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book