One Word Substitution

A pessimist is someone who habitually sees the negative or worst aspects of things - they 'look at the dark side'. An optimist is the opposite, seeing the positive side. Illegible refers to handwriting that cannot be read.

 Someone worth to be chosen for someting is eligible for that.

An eccentric person is someone with unconventional or unusual habits, behavior, or opinions that deviate from the norm. Genius refers to exceptional intellectual ability, while germicide kills germs. Eccentricity is about being uniquely different from societal norms.

A biped is an animal that walks on two feet. 'Bi-' means two, and '-ped' relates to feet. Humans are bipeds. A duet is a musical performance by two people, and novice means beginner. Biped specifically refers to two-footed locomotion.

To instigate means to urge, provoke, or incite someone to do something - often something negative or wrongful. Instigate can mean encouraging someone toward evil or harmful actions. Help is the opposite, and expiate means to make amends for sin.

Deterioration is the process of becoming progressively worse - going from bad to worse. It describes decline in quality, condition, or strength. Brittle means easily broken, eradicate means to eliminate completely, and blonde is a hair color.

A germicide is a substance that destroys germs or microorganisms. 'Germi-' refers to germs, and '-cide' means killing. Fatalist believes in destiny, drought is lack of rain, so germicide is the correct answer for something that destroys germs.

A spendthrift is someone who spends money wastefully or excessively - the opposite of miser. Cruel means causing pain, miser means hoarding wealth, so spendthrift is the correct term for someone who spends too much.

Matchless means having no equal or peer - something that has no match. It describes something unparalleled or incomparable. Original means first or primary, and epitaphic relates to tombstone inscriptions.

Irreparable describes something that cannot be repaired or fixed - damage beyond correction. 'Ir-' means not, 'reparable' means able to be repaired. Difficult and complex describe challenges but not impossibility of repair.

An aviary is a large cage, house, or enclosure for keeping birds. A parasol is a sunshade, a zoo houses various animals, making 'aviary' the specific term for a bird enclosure.

A parasol is a lightweight umbrella used as a sunshade, traditionally carried by ladies. Canopy refers to a covering, bumbershoot is informal for umbrella, but parasol specifically denotes a lady's sun umbrella.

Option 2 is the correct answer.

Option 1 is the correct answer.

Option 3 is the correct answer.