inconsistent

a. 不一致的, 易变的, 前后矛盾的
【法】 矛盾的, 不一致的, 不协调的

副词:inconsistently 

in.con.sis.tent

adj.（形容词）
Displaying or marked by a lack of consistency, especially:
缺乏一致性的：表现为缺少一致性的或以缺少一致性为标志的，尤指
Not regular or predictable; erratic:
不规律的或无法预知的；不稳定的：
例句：
inconsistent behavior.
前后不一致的行为

Lacking in correct logical relation; contradictory:
矛盾的：缺少正确的逻辑关系的；矛盾的：
例句：
inconsistent statements.
矛盾的表述

Not in agreement or harmony; incompatible:
不一致的或不协调的；不相容的：
例句：
an intersection inconsistent with the road map.
一个与交通图不符的十字路口

Mathematics Not solvable for the unknowns by the same set of values. Used of two or more equations or inequalities.
【数学】 不可解的：同一系列值的情况下由于有未知数而无解的。用于两个或两个以上的等式或不等式

【引伸】
in.consis.tently
adv.（副词）
<参考词汇><同义词>inconsistent,incongruous,incompatible,discordant,uncongenial,discrepantThese adjectives mean being in marked disagreement.
这些形容词都含有明显不一致的意思。
Inconsistent implies lack of uniformity,as in overall purpose, design, or content:
Inconsistent 表示缺乏一致性，如在整体的目的、安排或内容上：
例句：
Occasional hostility is inconsistent with true friendship.
偶尔的敌意与真正的友谊不相协调。

Incongruous suggests a lack of harmony and especially a lack of suitability or appropriateness, as between one person or thing and another:
Incongruous 表示不和谐，尤指如人或事间的不合适或不适当：
例句：
Negotiating with terrorists is incongruous with national policy.
和恐怖分子进行谈判不符合国家政策。

Incompatible implies conflict or an inability to coexist,as between persons of differing temperaments or things marked by fundamental differences or contradictions:
Incompatible 指冲突或无法共存，如在不同性情的人之间或存在着根本区别或冲突的事物之间：
例句：
.Here are two, not only different, but incompatible things, called by the same name, liberty. (Abraham Lincoln).
.这有两个不仅存在差别而且无法共存的事物，但它们却有一个共同的名字，叫作自由. （亚伯拉罕·林肯）。

Discordant implies a clash, as of temperaments, opinions, or principles:
Discordant 指性情、看法或原则上的抵触、冲突：
例句：
.[Imagination] reveals itself in the balance or reconciliation of opposite or discordant qualities. (Samuel Taylor Coleridge).
.［想象］ 在平衡或扭转对立或不一致的品质中显现出来. （萨缪尔·泰勒·克勒略支）。

Uncongenial suggests a lack of sympathy, as in character or nature:
Uncongenial 指在性格或天性上缺乏共同之处：
例句：
.Realpolitik thinking is uncongenial to American political discourse. (Christopher Layne).
.现实政治的思想和美国的政治演说是性质不同的. （克里斯托弗·雷纳）。

Discrepant stresses divergence where similarity or consistency is expected:
Discrepant 强调期望相似或一致时却出现了背驰现象：
例句：
The two witnesses gave widely discrepant testimony.
两个证人提供的证词出入很大