1 apagar, obumbrar, enegrecer, denegrir, escurentar, abacinar, turbar, afumar, foscar, abadanar, caliginar, ebanizar, enoitecer, turvar, lobregar, obscurecer, obnubilar, escurecer, ofuscar.
3 enevoar, nublar, entenebrecer, abaçanar, amorenar, ensombrar, enturvar, negrejar, confundir, sombrear, ofuscar.