adj.

1. Easily understood; intelligible.
2. Mentally sound; sane or rational.
3. Translucent or transparent. See synonyms at clear.

[Latin lūcidus, from lūcēre, to shine.]

lucidity lu·cid'i·ty or lu'cid·ness n.
lucidly lu'cid·ly adv.

adjective

1. Mentally healthy: compos mentis, rational, sane. Idioms: all there, in one's right mind, of sound mind. See sane/insane.
2. Admitting light so that objects beyond can be seen: clear, crystal clear, crystalline, limpid, pellucid, see-through, translucent, transparent. See clear/unclear.
3. Free from what obscures or dims: clear, crystal clear, crystalline, limpid, pellucid, see-through, transparent. See clear/unclear, touch/not touch.

adj

Definition: brilliant, shining
Antonyms: cloudy, dark, gloomy, muddled, murky, shadowy

adj

Definition: clear, transparent
Antonyms: confusing, foggy, muddied, unclear

adj

Definition: clear-headed, sensible
Antonyms: confused, muddled, puzzled, unclear, unreasonable

adj

Definition: evident, obvious
Antonyms: ambiguous, clouded, obscure, unclear, vague

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IN BRIEF: Easily understood. Also: Thinking clearly.

He is mad past recovery, but yet he has lucid intervals. — Miguel de Cervantes (1547-1616)

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Dansk (Danish)
adj. - klar, skinnende, strålende, lysende

Nederlands (Dutch)
duidelijk, begrijpelijk, doorschijnend, helder, volledig bij zinnen (tussen gekte door), lichtgevend

Français (French)
adj. - clair, lucide, lumineux

Deutsch (German)
adj. - klar, einleuchtend, hell

Ελληνική (Greek)
adj. - διαυγής, καθαρός, φαεινός, φωτεινός, σαφής, κατανοητός

Italiano (Italian)
lucido

Português (Portuguese)
adj. - lúcido

Русский (Russian)
понятный, светлый, яркий

Español (Spanish)
adj. - lúcido, claro

Svenska (Swedish)
adj. - klar, redig, tydlig, åskådlig, lättförståelig, fullt normal, (poet.) klar, strålande, genomskinlig, (biol.) glansig (yta)

中文（简体） (Chinese (Simplified))
清楚易懂的, 明晰的, 神志清明的, 头脑清楚的, 透明的

中文（繁體） (Chinese (Traditional))
adj. - 清楚易懂的, 明晰的, 神志清明的, 頭腦清楚的, 透明的

한국어 (Korean)
adj. - 명쾌한, 명석한, 빛나는

日本語 (Japanese)
adj. - 輝く, 澄んだ, 透明な, 明快な, 頭脳明晰な, 明晰な

العربيه (Arabic)
‏(صفه) مشرق, نير, صاف, رائق, شفاف, صافي التفكير, متسم بسلامه العقل, واضح, جلي, ممكن فهمه أو إدراكه‏

עברית (Hebrew)
adj. - ‮צלול דעת, שקוף, בהיר, מובן, ברור, חלקים וזורחים (פני צמח), שפוי (לפרקים)‬

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