A verbal suffix attached to an adjective stem indicating that someone (usually a third person) shows signs of a feeling or state; it becomes a godan verb (e.g., 寒がる).
子供は寒がってコートを着たがらなかった。
The child felt cold and didn't want to put on a coat.
彼女は恥ずかしがって人前で話せなかった。
She was shy and couldn't speak in front of people.
猫は水を怖がることが多い。
Cats often show fear of water.
あの子は新しい食べ物を警戒して嫌がる。
That child is wary of new foods and refuses them.
A suffix meaning 'to behave as if' or 'to pretend to be' (attaching to adjective stems or sometimes nouns), indicating an outward appearance rather than true feeling.
彼は強がっているが、本当は不安があるようだ。
He is putting on a brave face, but he actually seems anxious.
得意がる態度はあまり好かれない。
Acting as if you're proud is not very well liked.
知らないふりをして平気がるのはやめなさい。
Stop pretending not to know and acting unconcerned.