Start on a stage. A farce is the kind of play where a small lie leads to a hiding place, the hiding place leads to a bigger lie, four doors open and close at the wrong moments, and the audience can see the whole mess that the characters cannot. Farcical means belonging to that world. Point it at a play and you are naming a type of comedy. Point it at a meeting, a match or an election and you are saying something sharper: this was supposed to be real, and it is being run as though it were that play.
From the word’s history
Wiktionary gives the word as farce + -ical, formed after comical. The adjective therefore points straight back at the stage genre, which is why the theatrical use is the more basic of the two even though the critical use is the one people meet more often.
Wiktionary 說這個字是 farce 加 -ical，構詞方式比照 comical。所以這個形容詞的根就指向舞台上的劇種——也因此，講戲劇的那個意思才是比較基本的那一個，雖然大家更常遇到的是拿來批評的用法。
Wiktionary, "farcical" (etymology 1)
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