attenuate
thicken, strengthen, boister
benign
malevolent, deleterious
foible
forte, virtue
forgo
indulge in, partake of
fraught
devoid of, lacking, deficient in
luminous
dark, opaque, dim, murky
obsequious
assertive, bumptious, overbearing, candid, frank, independent
obtuse
acute, perceptive, qucik-witted
penitent
unrepentant, remorseless
peremptory
irresolute, tentative, mild, unassuming
rebuff
accept, welcome
sporadic
constant, steady, continuous, uninterrupted