Synonyms for Concentrated (same or very similar meaning)
WordNet sense 1 (in an extreme degree):
intenseWordNet sense 2 ((of light) transmitted directly from a pointed light source):
hardWordNet sense 3 (being the most concentrated solution possible at a given temperature; unable to dissolve still more of a substance):
saturatedWordNet sense 4 (having component parts closely crowded together):
thickFrom the ODE community, based on WordNetadd/edit