Useful words to know

squeal
v. intr.To give forth a loud shrill cry or sound. Slang. To turn informer; betray an accomplice or secret.

tattle·tale
n. One who tattles on others; an informer or talebearer.
adj. Revealing; telltale.

self-important
adj : having or showing feelings of unwarranted importance out of overbearing pride; "an arrogant official"; "arrogant claims"; "chesty as a peacock"

Source: Dictionary.com