strong, powerful, sturdy, robust, vigorous, potent

strong, intense, keen, acute, intensive, terrible

solid, strong, robust, firm, sturdy, durable

sonorous, strong, loud, stentorian, soniferous, orotund

impervious, impenetrable, immune, impregnable, invincible, strong

sharp, severe, acute, intense, squeaky, strong

active, live, buoyant, strong, pushing, quick

airtight, secure, compact, precise, strong, solid

violent, fierce, severe, vehement, strong, drastic

huge, large, massive, enormous, big, strong

fixed, constant, steady, stable, firm, strong