1. (adj) impenetrable
not admitting of penetration or passage into or through
Synonyms: dense, heavy
Antonyms: comprehendible, comprehensible, penetrable, thin
2. (adj) dense, heavy, impenetrable
permitting little if any light to pass through because of denseness of matter
Synonyms: laboured, sullen, laborious, heavy, dull, overweight, toilsome, slow, intemperate, sound, dumb, wakeless, dense, grueling, with child(p), threatening, grave, profound, lowering, cloggy, heavy(a), large(p), clayey, enceinte, grievous, fleshy, weighed down, hard, weighty, impenetrable, gruelling, expectant, lumbering, ponderous, backbreaking, sonorous, great(p), arduous, operose, dim, heavy(p), big(a), labored, punishing, thick, gravid, big(p), obtuse, leaden
Antonyms: comprehendible, penetrable, thin, comprehensible
3. (adj) impenetrable
impossible to understand
Synonyms: dense, heavy
Antonyms: penetrable, comprehensible, thin, comprehendible
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Synonyms for impenetrable 
