Verbs

(v)tame, chasten, subduecorrect by punishment or discipline
(v)tone down, moderate, tamemake less strong or intense; soften“Tone down that aggressive letter”, “The author finally tamed some of his potentially offensive statements”
(v)domesticate, cultivate, naturalize, naturalise, tameadapt (a wild plant or unclaimed land) to the environment“domesticate oats”, “tame the soil”
(v)domesticate, domesticize, domesticise, reclaim, tameovercome the wildness of; make docile and tractable“He tames lions for the circus”, “reclaim falcons”
(v)domesticate, tamemake fit for cultivation, domestic life, and service to humans“The horse was domesticated a long time ago”, “The wolf was tamed and evolved into the house dog”

Adjectives

(s)tameflat and uninspiring
(a)tamevery restrained or quiet“a tame Christmas party”, “she was one of the tamest and most abject creatures imaginable with no will or power to act but as directed”
(a)tame, tamedbrought from wildness into a domesticated state“tame animals”, “fields of tame blueberries”
(s)meek, tamevery docile“tame obedience”, “meek as a mouse” (Langston Hughes)