Synonyms

Ironic means expressing humor or meaning the opposite of what is stated, often with a sarcastic undertone. 'Disguisedly sarcastic' captures this essence well. 'Good natured' and 'bitter' are emotional traits unrelated to irony, while 'inflexible' refers to rigidity.

Secure means safe, protected, or free from danger. 'Safe' is the most direct synonym. 'Secret' means hidden knowledge, 'comfortable' refers to ease/well-being, and 'independent' means self-reliant - none capture the safety aspect.

Dynamic means characterized by constant change, activity, or energy. 'Active' is the best synonym here. While 'vigorous' and 'forceful' suggest energy, they don't capture the sense of constant change/movement. 'Robust' means strong/healthy, which is different.

Bifurcated means divided into two branches or parts. 'Forked' captures this perfectly - both describe something splitting into two. 'Reduced' means made smaller, 'stabbed' means pierced, and 'ploughed' means cultivated - none relate to division.

Ambition is an earnest desire for achievement or distinction. 'Desire' is a broad synonym but works. 'Aspiration' (C) is more specific to high goals but isn't the answer. 'Expectation' is what you anticipate, and 'goal' is the objective itself, not the drive toward it.

Tyranny means cruel and oppressive government or rule. 'Cruelty' captures the harsh/inhumane aspect. 'Misrule' is bad governance but not necessarily cruel. 'Power' is neutral - tyranny is abuse of power. 'Madness' is mental illness, unrelated.

Here, renounce is the correct synonym as to renounce is to refuse or resign a right or position.

Here, flexible is the correct synonym as it implies something being bendable or adaptable. 

Here, settled is the correct synonym as it implies to settle snugly or safely. 

'Tired' means 'weary' or ‘exhausted’.

'Closed’ means 'sealed' or ‘locked’.

'Quick’ means ‘fast’.

'Timid' means 'afraid'.

 Here, unity is the correct option as it implies the state or quality of being one. Teamwork implies the combined action of a group, agreement refers to the harmony or accordance in opinion or feelings and uniformity refers to the quality or state of being uniform.