"mildly hostile" is a correct phrase that can be used in written English.
For example, you could say: "He made a mildly hostile remark that made the room go silent."
The reaction was, to put it mildly, hostile.
Part of the background is that a majority of Britain's rising generation seems not merely indifferent to religion, but at least mildly hostile.
The prime minister had a mildly hostile reception after he arrived a few minutes late for the conference at the Queen Elizabeth Conference Centre in central London.
A substantial share of the population is either completely indifferent, or mildly hostile, to religion in all forms.Mr Vilks, who escaped yesterday's assault unhurt, has been involved in the conflict for years.
The technophobic Catholic hierarchy in Europe is mildly hostile to modern culture, science and capitalism, and technophile Muslim fundamentalists loathe all three.Slowly a phenomenon that America knows as "the culture wars" is going global.
I went on the native-baiting Sound of Music tour in Salzburg, once, and watched as the baffled and mildly hostile locals strained to look away as hordes of British, American and Australian visitors trudged around town, re-enacting key scenes from the film while screaming.
She sat in that house for eight months with us while Daddy spent most of his time in Washington fighting his case in what was, to put it mildly, a very hostile neighborhood.
That there was a Mormon presence in the town, was due largely to the work of Elder Willard Bean, who, Adams writes, was sent from Salt Lake City to Palmyra "to make converts, if possible, but particularly to make friends among the populace definitely suspicious, mildly contemptuous, and generally hostile".
Playing the games can and does stir hostile urges and mildly aggressive behavior in the short term.
Granted, he'd fanned the fires with a supremely cranky diatribe on his website, eRobertParker.com, which started off mildly civil and then went full-tilt hostile.
And the government, which was hostile toward the last such petition in 1990, now seems mildly receptive.
