frivolous

(A) pious
(B) inexpensive
(C) serious
(D) contemptuous

Explanation:-
frivolous means lacking seriousness, therefore serious is the most dissimilar

plain

(A) meadow
(B) ugly
(C) lovely
(D) unadorned

Explanation:-
plain means lacking in beauty; lovely means beautiful

denounce

(A) covet
(B) condemn
(C) blame
(D) deplore

Explanation:-
one meaning of to denounce is to speak out against; to covet means to wish for enviously

contrary

(A) urbane
(B) agreeable
(C) unpleasant
(D) despicable

Explanation:-
contrary means unwilling to accept control or advice; agreeable means ready or willing to agree

glower

(A) prairie
(B) smile
(C) raise
(D) throw

Explanation:-
glower means a sullen brooding look, therefore smile is the most dissimilar

exacting

(A) upright
(B) lenient
(C) sober
(D) general

Explanation:-
exacting means severe; lenient means indulgent

curtail

(A) remain
(B) detain
(C) placate
(D) prolong

Explanation:-
to curtail means to cut short; to prolong means to lengthen or extend

eminent

(A) imminent
(B) obscure
(C) retire
(D) unsure

Explanation:-
eminent means prominent, or famous; obscure means not prominent, or unknown

abdicate

(A) deny
(B) usurp
(C) blame
(D) renounce

Explanation:-
to abdicate means to renounce power or high office; to usurp means seize power or high office

indolent

(A) industrious
(B) complimentary
(C) native
(D) smooth

Explanation:-
indolent means lazy; industrious means hardworking

fortuitous

(A) undefended
(B) gratuitous
(C) deliberate
(D) impoverished

Explanation:-
fortuitous means occurring by chance, or accidental; deliberate means resulting from careful consideration, or voluntary

disparage

(A) hesitate
(B) settle
(C) trouble
(D) applaud

Explanation:-
to disparage means to speak slightingly about; to applaud means to express approval

dubious

(A) reliable
(B) pleasing
(C) rhythmic
(D) careful

Explanation:-
dubious means questionable or unreliable, therefore reliable is the most dissimilar

interdict

(A) continue
(B) abstain
(C) wallow
(D) sanction

Explanation:-
to interdict means to forbid; to sanction means to approve

mendacious

(A) bashful
(B) capacious
(C) veracious
(D) quiet

Explanation:-
mendacious means dishonest; veracious means truthful or honest

lassitude

(A) release
(B) demure
(C) fatigue
(D) vigor

Explanation:-
lassitude means weariness; vigor means strength or force

verdant

(A) dishonest
(B) suspicious
(C) moldy
(D) arid

Explanation:-
one meaning of verdant is green, especially with plant life; arid means dry, or lacking enough rainfall for agriculture

ductile

(A) unfeeling
(B) arrogant
(C) precious
(D) rigid

Explanation:-
one meaning of ductile is easily led or influenced; one meaning of rigid is inflexible, set in opinion

asperity

(A) moistness
(B) amenity
(C) sour
(D) generosity

Explanation:-
asperity means roughness of surface or manner; amenity means pleasantness or smoothness of manner

epicurean

(A) ascetic
(B) slovenly
(C) imprecision
(D) providential

Explanation:-
epicurean means having sensitive and self-indulgent taste especially in food and wine; ascetic means practicing self-denial and austerity