thick , sa . ( Of the lat. )( spissus ). 1. adj. said of a mass or fluid or gaseous substance: it has a high density or condensation. 2. adj. said of two or more things: that are very close together and tight, as often happens in wheats, groves and forests. 3. adj. thick, burly, massif. Thick walls. 4. adj. Ar. , Perú y Ven. Heavy, impertinent, annoying. 5. adj. p. us. Continued, repeated, frequent. 6. adj. p. us. Dirty, desaseado and greasy.