hindmost part (noun) tail: end piece, part
Sinonime: arrogant, big-headed,
boastful, cocky*, conceited,
egocentric, egoistic, haughty, high-and-mighty, inflated,
narcissistic, ostentatious, overweening, pleased with oneself,
proud, puffed up, self-important, stuck-up, swaggering, swollen-headed, vainglorious
Antonime: modest,
shy