Antonyms

 Constant means to remain the same (i.e. unchanging). With this in mind, the word with the opposite meaning is changeable. 

 Orderly refers to neat, clean and tidy, whereas congested refers to things which are tangled or stuffed into a small place. With this in mind, congested is the correct choice because it is opposite in meaning to orderly.

Conservative is tending to preserve established traditions or institutions and resisting changes, while progressive is moving forward or onward/ favouring changes and reforms.  

Dissatisfied means not content or happy with something. Contented means feeling or expressing happiness or satisfaction.

 Continual is directly opposite in meaning to ocassional as it refers to periods of time, therefore continual is the correct choice. Continuous refers to objects as whole.

Compatible means able to exist or occur together without conflict. Contradictory is the direct antonym, as it implies conflict or inconsistency.

Honest refers to being truthful or sincere. Corrupt is the antonym, as it refers to being dishonest or lacking integrity.

Scarce means insufficient or rare. Copious is the antonym, as it means abundant or plentiful.

Provincial refers to being narrow-minded or limited in outlook. Cosmopolitan is the antonym, as it implies being worldly or broad-minded.

 Cooperative means to work together towards a common goal. As such, competitive is the word most opposite in meaning because this refers to individuals working alone or against each other for a common goal.

 Cozy refers to the state of being incomfort, therefore the correct answer is uncomfortable because it is opposite in meaning.

Vivid means producing powerful feelings or strong, clear images in the mind. Insipid means lacking vigor or interest, making it a suitable antonym.

Eulogistic means highly praising. Contemptuous means showing contempt or disdain, which is the opposite of praise.

Celestial refers to the sky or outer space, often associated with the heavens. Earthly refers to things relating to the earth or mundane life, making it the correct antonym.

Demure means reserved, modest, and shy. Indecorous means improper or lacking in good taste, which is the opposite.