megalomaniac

noun
1
a person affected by or showing megalomania
خودبزرگ‌بین, دیوانهٔ عظمت, آدمی که دچار جنون عظمتی است
adjective
1
showing a strong feeling that you want to have more and more power
قدرت‌طلب, سلطه‌طلب
2
affected by a mental illness in which somebody has a much greater belief in their own importance or power than is reasonable
خودبزرگ‌بین, کسی که دچار خودشیفتگی افراطی است, خودشیفته