Is it good to be modest?

Yes

Not necessarily. It isn’t in one’s best interest to be humble or modest in a job interview. I’m good at what I do for a living; better than most people. In pretty much any group I work with I’m the alpha nerd. Thinking highly of your abilities isn’t bad if you have the skill to back it up. Being boastful and not delivering the goods is a recipe for disaster though. Everyone likes to see blowhards fail so don’t overestimate your abilities. If you are good at something it is good to be confident though.

which sense of the word? modest can mean not being egotistical, and it can also mean dressing in a non- slutty fashion.

Yes, I find modesty to be attractive as long as you’re not saying I’m ugly, or I’m stupid. Now that’s just annoying.