Antonyms for the word vivacious:boring, dispirited, dull, unattractive, unhappy
No, "un-" is a prefix meaning not or opposite. "Manageable" is an adjective on its own, meaning capable of being managed or controlled.
The quality or state of being vivacious., Tenacity of life; vital force; natural vigor., Life; animation; spiritedness; liveliness; sprightliness; as, the vivacity of a discourse; a lady of great vivacity; vivacity of countenance.
not helping or not being there when u need him/hre
The opposite of the noun "answer" would be "question."The opposite of the verb "answer" would be "ask."From the meaning of answer as a solution, the opposite would be the lack of a solution.The opposite of the verb form meaning to respond would be to ignore.(It has more than one appropriate opposite depending on the aspect being examined.)
Ignorance is the opposite, or antonym, of knowledge: "The condition of being uninformed or uneducated. Lacking knowledge or information."
Active, hard-working, or maybe lively?
Basically to be more fit. To be lean is the opposite of being fat or obese.
Verbal Irony (A+)
There is no opposite of the noun temptation except the lack of temptation (not being tempted). However, for tempted meaning enticed or attracted, the opposite effect could be repulsion. For the adjective tempted, there is the opposite untempted, or even discouraged.
Harb
The literary technique being used when the intended meaning of a statement is the opposite of what is stated is irony. Irony is often used to create humor, emphasize a point, or reveal a contrast between what is expected and what actually occurs.
Sublimation. The opposite is called deposition.