Adjective mild has 3 senses
  1. mild - moderate in type or degree or effect or force; far from extreme; "a mild winter storm"; "a mild fever"; "fortunately the pain was mild"; "a mild rebuke"; "mild criticism"
    intense, aggravated, bad, big, blood-and-guts, cold, concentrated, consuming, overwhelming, exquisite, keen, extreme, utmost, uttermost, fierce, tearing, vehement, trigger-happy, intensified, intensive, main, pressure-cooker, profound, raging, screaming, severe, terrible, wicked, strong, terrific, thick, deep, unabated, violent, wild
  2. meek, mild, modest - humble in spirit or manner; suggesting retiring mildness or even cowed submissiveness; "meek and self-effacing"
    Antonym: proud (indirect, via humble)
  3. balmy, mild - mild and pleasant; "balmy days and nights"; "the climate was mild and conducive to life or growth"
    Antonym: inclement (indirect, via clement)