The phrase "act blatantly" is correct and usable in written English.
It can be used to describe someone behaving in a very obvious or conspicuous manner, often in a way that disregards social norms or expectations.
Example: "He decided to act blatantly during the meeting, openly criticizing his boss without any concern for the consequences."
Alternatives: "behave openly" or "conduct oneself shamelessly".
No one today can put up with the first hour of "Madam Satan" (1930), with its plodding comedy about infidelity among the upper classes; but many people have fast-forwarded through it for the sake of chortling at its second act, a blatantly ridiculous set-piece of a masquerade ball on a zeppelin.
It makes no difference whether women involved accepted an apology, whether it was a "joke", whether there was no harm intended, whether some people need to lighten up, whether the world has become a politically correct nightmare, whether it was just a bit of fun, whether it was supposed to be a compliment, whether it was not that bad – each act was blatantly and indisputably sexist.
In neither act does anyone blatantly come across as racist or even judgmental of another.
Abbott's criticism of the UN follows his claim the Australian Human Rights Commission, in particular its president, professor Gillian Triggs, acted in a "blatantly partisan" way with its inquiry into children in immigration detention.
Last spring's decision to release secret Justice Department memos on the interrogations of suspected terrorists was a blatantly partisan act.
The act had quotas that blatantly favored northern and western Europeans and disadvantaged southern and eastern Europeans, and it excluded all Asians.
And though Mr. DiFrancesco opposed the increase, one aide said, to have vetoed it while Mrs. Whitman was traveling would have been seen as a blatantly political act.
STRONG SENSE OF IMPUNITY 8. (C) Based on evidence collected, Hamdard and his accomplices allegedly act with complete impunity, blatantly placing themselves above the law.
The unnamed adviser ruled out a trip by the Clintons to the "fly-infested Adirondacks" because it would be seen as a blatantly political act.
