后缀-acious = 多…的,充满…的,有…倾向的,具有…的特点 形容词后缀-acious 来源于拉丁语，属于复合后缀，是由 -aci + -ous 组合而成，它与名词后缀 -acity 相对应
英语词源：adjectival word-forming element meaning "given to, inclined to, abounding in," from Latin -aci- (nominative -ax), noun ending used with verbal stems, + -ous.
nclined to, given to, or having as a capacity.

[Originally and mainly from Latin words in -ax or -ac-, plus -ous.]

Words in -acious are adjectives. Words ending in -acity are corresponding nouns of quality or state (audacity, sagacity).

Examples of words in -acious
All examples derive from Latin.

audacious	willing to take risks	audax, bold
capacious	having a lot of space inside, roomy	capax, capac-, capable
efficacious	successful in producing a desired result	efficax, from efficere, to accomplish
loquacious	talkative	loquax, from loqui, talk
mendacious	not telling the truth	mendax, lying, related to mendum, a fault
pertinacious	holding firmly to an opinion or a course of action	pertinax, holding fast
pugnacious	eager or quick to argue or fight	pugnax, from pugnare, to fight
rapacious	aggressively greedy or grasping	rapax, from rapere, to snatch
sagacious	showing good judgement	sagax, wise
tenacious	holding fast to something, not easily giving up	tenax, from tenere, to hold
veracious	speaking or representing the truth	verax, from verus, true
vivacious	attractively lively and animated	vivax, lively or vigorous, from vivere, to live
voracious	wanting or devouring great quantities of food	vorax, from vorare, to devour

同缀词：
1.loquacious [loqu 言 + -acious 形容词后缀→]
adj. 多言的
2.capacious [cap 拿，抓住 + -acious 形容词后缀→]
adj. 容量大的
3.veracious [ver 敬畏 + -acious 形容词后缀→]
adj.真实的,可靠的
4.mendacious [mend 错误 + -acious 形容词后缀→]
adj. 欺骗的,扯谎的