Each countably compact space is feebly compact. For the proof of this cliam suppose the opposite. Let $\mathcal U$ be a locally finite infinite open cover of a countably compact space $X$. For each $U\in\mathcal U$ choose a point $x_U\in U$. Then consider a cluser point $x$ of the set $\\{x_U:U\in\mathcal U\\}$.
@TXC, I recommend you to look at the Section 2 of my article "Pseudocompact paratopological groups that are topological" about different weak forms of compactness and relations between them.