agonize

Definition:  to suffer mental pain

Synonym:  worry

Antonym:  joy; be happy

Sentence:  Did you agonize over your grades last night?

perilous

Definition:  dangerous

Synonym:  grave, risky, serious

Antonym:  safe, harmless, innocent

Sentence:  The trail was perilous because of snakes.

jostle

Definition:  elbow rudely

Synonym:  jab or shove

Antonym: 

Sentence:  The bully jostled the boy in the hallway.

elated

Definition:  happy, jubelent, proud

Synonym:  encourage

Antonym:  mad, angry

Sentence:  I was very elated to be president of the book club.

reluctantly

Definition:  unwilling

Synonym:  doubtful

Antonym:  happily

Sentence:  Jessie reluctantly took out the trash.

tranquil

Definition:  free from agitation

Synonym:  happy, silly, quiet, restful

Antonym:  loud, noisy, boisterous

Sentence:  I was very tranquil when I took my nap.

melancholy

Definition:  gloomy state of mind

Synonym:  sad

Antonym:  happy

Sentence:  Mary was meloncholy because her dog died.

anguish

Definition:  suffering or pain

Synonym:  agony, distress, hurt

Antonym:  bliss, joy, cheerfulness

Sentence:  Joe anguished over his sick cat.

stern

Definition:  firm or strict

Synonym:  tough, strict

Antonym:  gentle, lenient

Sentence:  My teacher is very stern.

Irrelevant

Definition:  not important

Synonym:  extraneous, immaterial

Antonym:  important, applicable

Sentence:  The rude girl's comment was irrelevant.

Composition

Definition:  the way something is put together

Synonym:  arrangement, format

Example:  a writing assignment

Sentence:  Jessie wrote a composition about dolphins for Science class.

broad

Definition:  measured from side to side

Synonym:  thick

Antonym:  skinny, thin

Sentence:  The swimmer had broad shoulders.

distinguish

Definition:  seen as different

Synonym:  different, separate

Antonym:  same

Sentence:  Jack could distinguish the differences between his two goldfish.

despair

Definition:  to not have hope

Synonym:  sad

Antonym:  brighten, cheer up

Sentence:  Don't despair, things will get better.

mutter

Definition:  to complain quietly

Synonym:  mumble, complain

Antonym:  rejoice, delight

Sentence:  You could hear Jane mutter rude comments when her mother corrected her behavior.

Immense

Definition:  marked by greatness; supremely good

Synonym:  big, super, big

Antonym:  little, teeny, tiny

Sentence:  The Grand Canyon is immense.

meager

Definition:  very small

Synonym:  spare, scanty, slim

Antonym:  plentiful, bountiful

Sentence:  The stray dog ate a meager meal of stale bread.

waver

Definition:  to sway

Synonym:  sway, teeter, stagger

Antonym:  stand strong

Sentence:  Michelle did not waver from her plan to go skydiving.

differ

Definition:  to be different

Synonym:  contrast, vary

Antonym:  match, same

Sentence:  The twin boys differ in their choice of hair style.