irregular, casual, informal

名詞 irregular:

1. a member of an irregular armed force that fights a stronger force by sabotage and harassment
   同義詞：guerrilla, guerilla, insurgent
2. merchandise that has imperfections; usually sold at a reduced price without the brand name
   同義詞：second

形容詞 irregular:

1. contrary to rule or accepted order or general practice
2. (of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement
3. not occurring at expected times
   同義詞：unpredictable
4. (used of the military) not belonging to or engaged in by regular army forces
5. deviating from normal expectations; somewhat odd, strange, or abnormal
   同義詞：atypical
6. lacking continuity or regularity
   同義詞：temporary
7. of a surface; not level or flat
8. independent in behavior or thought
   同義詞：maverick, unorthodox

1. She tested the whole class on irregular verbs.
   她對全班學(xué)生進行不規(guī)則動詞測驗。
2. This dictionary has several appendices, including one on irregular verbs.
   這部詞典有幾項附錄，包括不規(guī)則動詞附錄。
3. The irregular lengthening of a normally short syllable.
   一個正常情況下短音節(jié)的不規(guī)則的延長
4. Irregular facial features.
   不規(guī)則的臉部特征
5. The coastline in this area is quite irregular.
   這個地區(qū)的海岸線非常不整齊。
6. To go away without telling your father is most irregular.
   不跟你父親打個招呼就走是非常不合適的。

ir.reg.u.lar

adj.Abbr. irreg.（形容詞）縮寫 irreg.
Contrary to rule, accepted order, or general practice:
不合規(guī)則的：與法規(guī)、既定規(guī)則或習(xí)慣做法相背的：
例句：
irregular hiring practices.
不規(guī)范的雇傭

Not conforming to legality, moral law, or social convention:
不法的，違規(guī)的：不合法律、道德準(zhǔn)則或社會習(xí)慣的：
例句：
an irregular marriage.
不合法的婚姻

Not straight, uniform, or symmetrical:
不規(guī)則的，異常的：不符常規(guī)的、不統(tǒng)一的或不對稱的：
例句：
irregular facial features.
不規(guī)則的臉部特征

Of uneven rate, occurrence, or duration:
不穩(wěn)定的，無規(guī)律的：頻率、出現(xiàn)或持續(xù)時間不穩(wěn)定的：
例句：
an irregular heartbeat.
心律不齊

Deviating from a type; atypical.
背離一種類型的；非典型的
Botany Having differing floral parts, as of a zygomorphic or asymmetrical flower.
【植物學(xué)】 不規(guī)則的：花的組成部分相異的，如兩側(cè)對稱或不對稱的花
Falling below the manufacturer`s standard or usual specifications; imperfect.
不完美的：在制造者的標(biāo)準(zhǔn)或通常要求之下的；不完美的
Grammar Departing from the usual pattern of inflection, derivation, or word formation, as the present forms of the verbbe or the plural noun children.
【語法】 不規(guī)則的：背離變形的、派生的或構(gòu)詞的通常程式的，如動詞be 的現(xiàn)在時形式或復(fù)數(shù)名詞 children
Not belonging to a permanent, organized military force:
非正規(guī)的：不屬于永久的，有組織的軍隊的：
例句：
irregular troops.
非正規(guī)軍隊

n.（名詞）
One, such as an item of merchandise, that is irregular.
不合格品，次品：一件不規(guī)則的東西，如商品
A soldier, such as a guerrilla, who is not a member of a regular military force.
非正規(guī)軍：非正規(guī)軍隊成員的士兵，如游擊隊隊員

【引伸】
irreg.ularly
adv.（副詞）