concentration (percentage of dissolved material in a solution); consistency; thickness; density; viscosity

to concentrate; to condense; (nuclear energy) to enrich; espresso coffee (abbr. for 意式濃縮咖啡|意式浓缩咖啡[Yi4 shi4 nong2 suo1 ka1 fei1])

thick smoke

thick; murky

thick fog

strong (smell); thick (fog)

Revlon (American brand of cosmetics)

strong smell of gunpowder; fig. tense situation; standoff