Tame or nice, a mix of them is the closest answer. The first word would better describe it if you could choose only one, though.
Docile
Easy going Meek Obedient Pliable Gentle
No, "docile" does not mean dumb. The term "docile" refers to someone or something that is easily taught, managed, or led; it suggests a willingness to be guided or controlled. A docile person can be intelligent but may choose to be compliant or passive in certain situations. Hence, docility is about temperament rather than intelligence.
Something quiet and tame.
The antonym of docile is defiant or obstinate.
Docile
obedient
submissive, yielding, docile, gentle.
obedient, resigned, gentle, soft, cool
docile
Easy going Meek Obedient Pliable Gentle
compliant, docile, obedient, pliable, tractable, yielding are synonyms for pliant.
meek
Docile or compliant would be good synonyms for submissive.
meek also docile as in, a docile horse
A synonym for "acquiescent" is "compliant." Both terms describe a tendency to agree or yield to the wishes of others without resistance. Other synonyms include "submissive" and "docile."
The opposite of "ferocious" would be calm, tame, docile, or unexcited.