Well, it is difficult to explain.
I think "charmless attitude" is basically correct. But, if you want to know further you should look into the word, . If you check a thesaurus, you find it is rather "devious or indirect ()." It is not about appearance, but a spirit. <
We do not call a devious politician * because we do not expect a politician is adorable.
So, typically a child, supposed to be biddable, could be . For example, you want to do some favour for him/her, but s/he does not accept it thinking "You cannot trick me." I think this is the most typical .
Also, new hires can be . They are supposed to ask for help. But, they may refuse.
Dating is basically giving and accepting favours and offers. In dating scenarios, can be liberally translated to "no further intentions" because people sometimes refuse to accept offers to show they have no further intentions. But, sometimes, it is just because they are not used to it, or shy.