"Ruthless" means showing no mercy or compassion, being cruel or harsh. The opposite of this is "merciful," which means showing compassion or forgiveness, particularly when one has the power to punish or harm.

Opposite words: Merciful, Humane, Compassionate, Lenient, Affectionate. 

"Analogous" means similar or comparable in certain respects. The opposite of analogous would be "heterogeneous," which refers to things that are different in kind or composition, indicating a lack of similarity.

Opposite words: Heterogeneous, Varying, Diversified, Disparity. 

"Alienate" means to cause someone to feel isolated, estranged, or distanced from others. The opposite of this would be "reunite," which means to bring people back together, ending isolation or estrangement.

Opposite words: Reunite, Assemble, Concourse. 

"Accolade" refers to an award or honor given in recognition of someone's achievements. The opposite would be "criticism," which involves expressing disapproval or pointing out faults or shortcomings.

Opposite words: Condemnation, Indictment, Censure, Chastise, Criticism.

"Perpetual" refers to something that is constant, ongoing, and never-ending. The opposite of this would be "intermittent," which describes something that occurs at irregular intervals or stops and starts, rather than being continuous.

Opposite words: Transitory, Temporary, Intermittent, Evanescent, Short lived.

"Equivocal" means unclear, ambiguous, or having more than one possible interpretation. The opposite of equivocal would be something that is clear and obvious, like "evident."

Opposite words: Obvious, Evident, Perspicacious, Clear, Lucid, Pellucid.

"Fusion" refers to the process of combining or blending two or more things into one. The opposite of fusion would be "separation," which refers to the act of dividing or splitting things apart.

Opposite words: Scattering, Furcating, Fragmentation, Separation, Decentralize.

"Lull" means to calm or soothe, often by bringing about a sense of quiet or peace. The opposite would be "instigate," which means to provoke or stir up, usually in a way that disrupts calmness.

Opposite words: Waken, Agitate, Instigate, Impel, Foment.

"Outset" refers to the beginning or start of something. The opposite of this is "conclusion," which refers to the end or finishing point of an event or process.

Opposite words: Conclusion, End, Ultima, Epilogue, Dernier.

"Preserve" means to keep something in its original state or protect it from harm. The opposite of this would be "ruin," which means to destroy or damage something, often irreparably.

Opposite words: Ruin, Impair, Damage, Distort, Detriment, Mischief, Lesion, Maim, Bale.