[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 |