这些形容词都含有“易碎的”之意。
brittle : 指没有弹性或伸缩性的脆性材料，暗示受压或被扭曲时易碎。例如：The pond was covered in a brittle layer of ice.池塘覆盖了一层易碎的冰。
fragile : 除指易碎外，还指人身体虚弱，动辄就得病。例如：The old lady was increasingly fragile after her operation.那位老太太手术后身体越来越虚弱。
frail : 多指人体虚弱，也指某物不耐用，易碎易损。例如：This glass disc looks very fragile.这个玻璃盘子看起来很容易碎。
brittle
hard but liable to break or shatter easily
脆的，易碎的
her bones became fragile and brittle.
她的骨头变得脆而易碎。
(of a sound, especially a person's voice)unpleasantly hard and sharp and showing signs of instability or nervousness
（声音，尤指人的嗓音）尖利刺耳的
a brittle laugh.
尖利刺耳的笑声。
(of a person or behaviour)appearing decisive and aggressive but unstable or nervous within
（人，行为）外强中干的。
n.[mass noun]
a brittle sweet made from nuts and set melted sugar
果仁薄脆糖
peanut brittle.
花生薄脆糖。
[ 派生词 ]
brittlely （或brittly） adverb, brittleness noun．
[ 词源 ]
late Middle English, ultimately of Germanic origin and related to Old English breotan ‘break up’.
fragile
(of an object) easily broken or damaged
（物体）易碎的；易损坏的；脆的。
easily destroyed or threatened
易被摧毁的；易被吓倒的
you have a fragile grip on reality.
你控制不住现实。
(of a person)not strong or sturdy; delicate and vulnerable
（人）脆弱的；纤弱的；弱不禁风的。
[ 派生词 ]
fragilely adverb, fragility noun.
[ 词源 ]
late 15th cent. (in the sense ‘morally weak’): from Latin fragilis, from frangere ‘to break'. The sense ‘liable to break' dates from the mid 16th cent.
frail
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详细释义
(of a person) weak and delicate
（人）脆弱的；虚弱的
a frail voice
虚弱的声音
she looked frail and vulnerable.
她看上去弱不禁风。
easily damaged or broken; fragile or insubstantial
易损坏的，易破的；易碎的，不坚固的
the balcony is frail
阳台不坚固
the frail Russian economy.
俄罗斯脆弱的经济。
weak in character or morals
（性格、道德方面）脆弱的，软弱的；意志薄弱的。
n.
US informal, dated a woman
〈美， 非正式，旧〉 女人。
[ 派生词 ]
frailly adverb, frailness noun.
[ 词源 ]
Middle English: from Old French fraile, from Latin fragilis (see FRAGILE).