Cessation, abeyance and deadlock mean discontinuance. 

Naive is used to identify someone who is an amateur.

Industrious, diligent and alert describe someone who is very serious and clever at work. Lenient is usually associated with a soft approach.

Continuation is the odd word out.

Skeptic, dubious and suspicious are synonyms. Doubtless is the antonym.

Frisky, frantic and frenzy are synonyms, which mean excitement.

Finesse, adroit and adept is associated with skillfullness.

Finale, climax and end usually comes at the end. Debut is referred to as the first appearance.

Reward, award and salary are remunerations. Pittance means a small amount of share.

Interrogate, questioning and investigate are activities that do not please anyone. 

Complicate, intricate and complex all mean 'difficult'.

Inclined, tendency and bent means natural inclination or tendency.

Repeal, shun and repulse are words, which denote dislike, caution. 

Entreat, beg and plead means the same. Command is the opposite.

Execute, implement and follow means to carry out, to accomplish. 

Cumulative, sum and grand are associated with total. Partial is the odd word out.

Timid is the odd word out. The rest of the words belong to the same category.

Laurels, accolades and rewards are associated with honour, awards. Defame is the odd word out.

Abort, retrograde and cease means to stop. Initiate means to stop.

Judicious, careful and sensible describe someone who is wise.

Wise, prudent and reasonable are qualities of a sensible person. Lunatic means mad.

Stake, venture and risk is associated doubt. 

Compliance, alliance and accordance all mean 'to agree'. Anti means 'against'.

Conservative is someone who holds to the old values, stagnant is still  and static means no motion. Liberal means willing to accept changes.

Pious, generous and humane are positive qualities of a person, wicked is negative.