What is the Latin word for crepuscular?

The usual Latin words for “crepuscular” are sublūstris, subobscūrus. The right choice depends on the sense; see the distinctions below.

English → Latin

“crepuscular” in Latin

sublūstrisgleaming, glimmering subobscūrussomewhat obscure

The English word crepuscular itself goes back to Latin crepusculum.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

crepuscular

sublucanus (towards day-break): sublustris (somewhat bright): subobscurus (somewhat dark).

Quick answer

What is the Latin word for crepuscular?: The usual Latin words for “crepuscular” are sublūstris, subobscūrus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.