"earnest actions" is a correct and usable phrase in written English.
It is typically used to describe actions or deeds that are sincere, serious, and done with great effort. Example: The success of the charity fundraiser was owed to the earnest actions of the volunteers who tirelessly worked to achieve their goal.
And they forced Hart, at least, into earnest action.
Wisely, though, Krist puts O'Neill at the center of the story: a man of swift and earnest action and company loyalty.
This earnest action is countered by several things.
I always saw myself as more of a Dominic Santini kind of supporting role, so I'll hold out for Earnest Borgnine action figures.
Now that a settlement has been reached, eager lawyers can get to work in earnest on class-action lawsuits on investors' behalf.
The action, Earnest says, "does not reflect [the interim government] commitment to begin an inclusive process to make that transition back to democracy".
Others made earnest pleas for action against global warming, and the atmosphere was mostly calm until a group of masked anarchists clad in black arrived on the scene.
Mr. Galifianakis's Gleasonesque movements and deadpan, behind-the-beat timing serve him well in this role, as does his ability to seem completely in earnest even when his actions and utterances are bizarre or nonsensical.
Ananya Dance Theater Company's "Daak" (or "Call to Action"), intensely earnest and earnestly intense, mixed Indian and modern-dance styles in equal measure.
Similarly, in Wilde's The Importance of Being Earnest, we find the action of the play when we ask what its two male protagonists have in common: we find that both Jack and Algernon create a world of fantasy in order to evade the social limitations of their daily lives, but both find that their imaginary worlds can be made real through love.
