Collocations for mild - adj.

be
become, turn (esp. BrE)
Later in the week the weather turned very mild.

remain

extremely, fairly, very, etc.
relatively
It's relatively mild for the time of year.

generally
The climate in Japan is generally mild.

surprisingly, unseasonably, unusually
The late summer air was surprisingly mild.

be, seem
The infection seems quite mild, so she should be better soon.

extremely, fairly, very, etc.
comparatively, relatively
The pain is comparatively mild at the moment.

reasonably

be, sound
His voice was deceptively mild.

seemingly
deceptively

meek and mild
She's not so meek and mild as she seems.

Mild is used with these nouns:
amusement, annoyance, antiseptic, astonishment, attack, bout, case, cheese, chilli, climate, cold, concussion, confusion, cough, curiosity, curry, defect, dehydration, depression, diarrhoea, disability, disappointment, disapproval, discomfort, disease, disgust, downturn, elation, electric shock, euphoria, exaggeration, exasperation, fever, flavour, flu, form, hallucination, handicap, headache, heart attack, hysteria, illness, inconvenience, infection, inflammation, irritation, manner, mustard, narcotic, nausea, pain, panic, paranoia, reaction, rebuke, recession, reproach, sedation, sedative, shampoo, shock, side effect, soap, spell, steel, stroke, surprise, swear word, symptom, taste, term, tone, weather, winter