pensive

詳細解釋：

pen.sive

adj.（形容詞）
Deeply, often wistfully or dreamily thoughtful.
沉思的，冥想的：通常是憂鬱或朦朧地深深思考的
Suggestive or expressive of melancholy thoughtfulness.
憂心忡忡的，鬱鬱寡歡的：讓人聯想起或表達憂鬱的沉思的

來源：
Middle English pensif
中古英文 pensif
from Old French
源自 古法文
from penser [to think]
源自 penser [想]
from Latin pôns3re [frequentative of] pendere [to weigh] * see (s)pen-
源自 拉丁語 pôns3re [] pendere的重複動詞 [權衡] *參見 (s)pen-

【引伸】
pen.sively
adv.（副詞）
pen.siveness
n.（名詞）
<參考辭彙><同義詞>pensive,contemplative,reflective,meditative,thoughtfulThese adjectives mean characterized by or disposed to thought, especially serious or deep thought.
這些形容詞主要用於形容嚴肅或深沉的思想。
Pensive often connotes thought of a wistful, dreamy, or sad quality:
Pensive 意指一種愁悶、冥思或憂傷的思想：
例句：
.while pensive poets painful vigils keep. (Alexander Pope).
.當冥想的詩人守夜憂思時. （亞歷山大·柏蒲）。

例句：
Seeing the depth of her despair, he grew pensive.
看到她陷入無限的絕望，他沉入深深的憂思中。

Contemplative implies slow, directed consideration,often with conscious intent of achieving better understanding or spiritual or aesthetic enrichment:
Contemplative 暗指一種緩慢而有指導的深思，常帶有為了更好地理解或獲得精神或美感上的富足的有意識的意圖：
例句：
.The Contemplative Atheist is rare . . . And yet they seem to be more than they are. (Francis Bacon).
.喜歡深思的無神論者是很罕見的…他們看起來實際更喜歡思考. （弗朗西斯·培根）。

Reflective suggests careful, analytical deliberation, as in reappraising past experience:
Reflective 暗指一種如總結過去的經驗教訓等仔細周到和具分析性的思考：
例句：
.Cromwell was of the active, not the reflective temper. (John Morley).
.克倫威爾生性躁動，缺乏深思熟慮的性格. （約翰·莫利）。

Meditative implies earnest, sustained thought:
Meditative 暗指一種熱切而持續的想法：
例句：
The scholar was reticent, aloof, and meditative.
這位學者寡言少語、離群索居而且總在沉思。

Thoughtful can refer to absorption in thought or to the habit of reflection and circumspection:
Thoughtful 可指陷入沉思或周密考慮及思考的習慣：
例句：
The judge looked thoughtful, then granted the motion.
法官沉思了一會兒，然後批准了這一議案。

例句：
Thoughtful voters viewed the proposed legislation with alarm.
深思熟慮的投票人謹慎地看待這一立案法律