'Prodigal' means wastefully extravagant. 'Frugal' is its direct opposite, meaning sparing or economical with regard to money or food.

'Taciturn' describes a person who is reserved or uncommunicative in speech. 'Loquacious' is the antonym, meaning tending to talk a great deal; talkative.

'Obdurate' means stubbornly refusing to change one's opinion or course of action. 'Malleable' is the opposite, meaning easily influenced or pliable.

'Ephemeral' means lasting for a very short time. Its opposite is 'permanent', which means lasting or existing for an indefinitely long time.

To 'mitigate' means to make something bad less severe or painful. To 'aggravate' is the opposite, meaning to make a problem or injury worse or more serious.

'Esoteric' refers to something intended for or likely to be understood by only a small number of people with a specialized knowledge. The opposite is something that is 'commonly known'.

To 'laud' is to praise someone or something highly. 'Censure' is the direct antonym, meaning to express severe disapproval or to criticize harshly.

'Auspicious' means conducive to success or favorable. 'Ominous' is its opposite, giving the worrying impression that something bad is going to happen.

To 'assuage' is to make an unpleasant feeling less intense. The direct opposite is to 'intensify', which means to become or make more intense.

Laconic means using very few words. Verbose means using or expressed in more words than are needed. Pithy, succinct, and brief are synonyms for laconic.

Perfidious means deceitful and untrustworthy. Loyal means giving or showing firm and constant support. Treacherous and deceitful are synonyms for perfidious.

Capricious means given to sudden and unaccountable changes of mood or behavior. Steadfast means resolutely or dutifully firm and unwavering.

Querulous means complaining in a whining or petulant manner. Content means satisfied and willing to accept a situation. Petulant and peevish are synonyms.

Fecund means producing or capable of producing an abundance of offspring or new growth; fertile. Barren means unproductive or unable to produce.

Ubiquitous means present, appearing, or found everywhere. Scarce means rare or insufficient for the demand. Omnipresent and pervasive are synonyms.

Salubrious means health-giving or healthy. Deleterious means causing harm or damage. The other options are synonyms.

Ameliorate means to make something bad or unsatisfactory better. Exacerbate means to make a problem or bad situation worse.

Gregarious means fond of company; sociable. Reclusive means avoiding the company of other people; solitary.

Ostensible means stated or appearing to be true, but not necessarily so. Genuine means truly what something is said to be; authentic.