Word parts slug + -ish Pronunciation IPA (key): /ˈslʌɡɪʃ/ Audio (UK)(file) Adjective Positive sluggish Comparative sluggisher Superlative sluggishest Positive sluggish Comparative more sluggish Superlative most sluggish A sluggish person is someone who is lazy.Wikiwand - on Seamless Wikipedia browsing. On steroids.