What is selfless means in scientific attitudes?

Selfless means unselfish - the person who doesn't just think about his own profit/advantage.

Here are some more synonyms -

altruistic, benevolent, charitable, chivalrous, denying, devoted, disinterested, extroverted, generous, helpful, humanitarian, incorruptible, indulgent, liberal, noble, self-denying, self-effacing, self-forgetful, self-forgetting, self-sacrificing

Here are some antonyms -

greedy, selfish, uncharitable