word: acrimony

meaning: bitterness and resentment, especially in speech, attitude, or tone

synonyms: rancour, animosity, hostility

usage: I bear no feeling of acrimony with respect to the money I sent for Apu kaku.

word: redundant

meaning: 1. no longer needed or wanted 2. repeated meaning

synonyms: 1. superficial 2. tautological

usage: 1. The impaired phone is redundant and should be disposed of.

2. "A true fact" and "a free gift" are redundant expressions.

word: belligerent
meaning: inclined or eager to fight; hostile or aggressive.
synonyms: bellicose, pugnacious
usage: Anupam always maintains a belligerent attitude towards all who are more popular or more successful than him in some way.

word: perfunctory

meaning: done as a matter of duty or custom, without thought, attention, or genuine feeling

synonyms: superficial, mechanical, cursory

usage: I gave a few perfunctory ticks on Shaima's copy.

word: chagrin

meaning: A keen feeling of mental unease, as of annoyance or embarrassment, caused by failure, disappointment, or a disconcerting event.

Synonyms: mortification, humiliation

Usage: Much to my chagrin, I did not win the highly publicized event.

word: diffident

meaning: showing modest reserve; lacking self confidence

synonyms: reserved, shy, timid, unsure

usage: Because she was only a first year student, she was diffident when commenting on a professor's lecture.

I was diffident at first, but then I got to know that the people were really nice and I opened up more.

word: munificent

meaning: generous

synonyms: lavish; prodigal

usage: Munificent as life was to me, I added to that munificence.