Ferocious

The most appropriate antonym of the word ferocious is gentle.

• Ferocious means savage, fierce, or violent.
• Gentle means kind, mild, or tender.

The other words do not have the same meaning as ferocious and are therefore not antonyms.

• Violent means forceful or aggressive in a way that may be injurious or destructive.
• Lazy means unwilling to work or exert oneself.
• Cruel means deliberately inflicting pain or suffering on others.