がっしり
がっしり · gasshiri · JLPT N1 · adverb
firmly
🧱 がっしり sounds like 'gasp-sh-ree': gasp hard, grip firm, stays solid like a brick wall
The sound 'gasshiri' echoes 'gasshari' (sturdy, burly). Think of a stone wall built tight: it holds firmly and does not budge.