Idiom means to work very late.
Accommodate - double c, double m.
Honest starts with vowel sound, use an.
Verbose=too many words. Antonym=Concise.
Benevolent = well-meaning, Kind.
Pellucid means translucently clear in style or meaning; easily understood or transparent.
Lucid is the best synonym, meaning clear, easy to understand, and mentally bright.
Murky, ambiguous, and convoluted all suggest cloudiness, confusion, or difficulty in understanding, making them antonyms of pellucid.
Sanguine means confidently optimistic or positive in an assessment, especially in an unjustifiably positive way.
Optimistic is the appropriate synonym, meaning hopeful and confident about the future.
Pessimistic, doubtful, and skeptical all represent negative or uncertain outlooks, contradicting the meaning of sanguine.
Propitious means giving or indicating a good chance of success; favorable or advantageous.
Auspicious carries the same meaning, referring to circumstances that suggest future success.
Unfavorable, ominous, and disastrous all represent negative or adverse conditions, making them antonyms rather than synonyms.
Obfuscate means to make something unclear, confusing, or difficult to understand.
Obscure is the best synonym as it also means to make dim, unclear, or hard to perceive.
Clarify, illuminate, and simplify all represent opposite meanings that would make things clearer rather than murkier.
Ephemeral means lasting for a very short time or temporary in nature.
Transitory is the most accurate synonym, meaning short-lived or fleeting.
Permanent, substantial, and durable all convey opposite meanings of permanence and stability.