penumbral
In partial shadow
Penumbral describes something relating to or resembling a penumbra—the partial shadow between full light and complete darkness, as at the edge of an eclipse.
The word extends to things that exist in a gray area or at the margins of clarity: penumbral regions of the law, penumbral rights implied but not explicitly stated.
A penumbral eclipse occurs when the moon passes through Earth's outer shadow.
External computer add-on
- liminalAt a threshold
- thresholdPoint of beginning
- borderlineEdge of acceptability
- marginEdge of a page
fringe · edge · transitional · intermediate · cusp · verge · gradual · blurred
Light after sunset
- half-lightPartial illumination between extremes
- semidarknessFaint, insufficient light
- dimnessInsufficient illumination
- shadeDarkness from blocked light
gloaming · dusk · crepuscular · dappled · gloom · murk · obscurity · faintness
Of the moon
- moonNatural planetary satellite
- occultationCelestial body blocking another
- syzygyTrilinear celestial arrangement
- totalityComplete aggregate amount
annular · corona · celestial · astronomy · orbit · phase · perigee · apogee
Not firmly known
- nebulousUnclear and formless
- vagueUnclear, ill-defined
- indeterminateNot exactly known
- hazyUnclear, indistinct
unclear · ill-defined · equivocal · indefinite · murky · doubtful · imprecise · ambivalent
peripheral
External computer add-on
- liminalAt a threshold
- thresholdPoint of beginning
- borderlineEdge of acceptability
margin · fringe · edge · transitional · intermediate · cusp · verge · gradual · blurred · indistinct
twilight
Light after sunset
- half-lightPartial illumination between extremes
- semidarknessFaint, insufficient light
- dimnessInsufficient illumination
shade · gloaming · dusk · crepuscular · dappled · gloom · murk · obscurity · faintness · gradation
lunar
Of the moon
- moonNatural planetary satellite
- occultationCelestial body blocking another
- syzygyTrilinear celestial arrangement
totality · annular · corona · celestial · astronomy · orbit · phase · perigee · apogee · transit
uncertain
Not firmly known
- nebulousUnclear and formless
- vagueUnclear, ill-defined
- indeterminateNot exactly known
hazy · unclear · ill-defined · equivocal · indefinite · murky · doubtful · imprecise · ambivalent · unresolved
- Darknessblackness, pitch black, pitch-black, inkiness, murk
penumbralclear
Without obstruction or fog
distinct · sharp · well-defined · unambiguous · crisp