In General
Mainly, Mostly
A big approximation is when I say something in general. I'm mainly and mostly telling everything.
たいがい
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
万引きをするのは大概、退屈で孤独を感じている女性だと言う人がいますが、ある調査が男性の方が女性よりも万引きをすることが多い可能性を示唆しているそうですよ。
Some people think shoplifters are mainly bored, lonely women, but I heard that a study suggested that more men shoplift than women.