delinquent noun [C]. âº a âperson, usually âyoung, who âbehaves in a way that is âillegal or not âacceptable to most âpeople: âjuvenile delinquents.
Probably the major advantage of walking upright was that it freed the hands to use tools and carry (the pray). Another advantage is seeing further than on four legs, without the need to stop walking and raising oneself for a little while to look around ( like some animals do). Comments. Report.
For sitting upright (with the 3 curves of the spine gently at their place), easily and without help, you need a strong AND flexible back, with strong muscles. You also need long hamstrings, which are the second severest limiting factor to a good sitting posture.