Please resubmit your question as it is not clear what the basis of your question is. Thank you.
Because someone might have stolen your position in a certain subject.
Yes, the word underestimate is a noun as a word for an estimate that is too low.The word underestimate is also a verb meaning to perceive that something or someone is of a lower value than it actually is.
People are jealous because someone else is getting something or even someone that they cannot get.
Make him/ her jealous.
A jealous significant other is someone like a girlfriend boyfriend, husband, wife that is jealous of you, if you get what im saying :s basically someone significant that's jealous bout something.
underestimate
You underestimate my power.Do not underestimate the deliciousness of tea.
Jelousy is a common feeling and you don't have to love someone in order to get jealous. You could hate someone and be jealous.
be jealous and then try to be friends with that boy until you get close and then you can make her jealous.
Jealous means envious or wanting something someone else has. 'He was jealous of his brother's good fortune.' Sometimes it means you are protective of what you already have. 'The lords were jealous of their privileges.'
Tagalog of underestimate: minamahina
Underestimate