Ardent
–adjective
1. having, expressive of, or characterized by intense feeling; passionate; fervent: an ardent vow; ardent love. 
2. intensely devoted, eager, or enthusiastic; zealous: an ardent theatergoer. an ardent student of French history. 
3. vehement; fierce: They were frightened by his ardent, burning eyes. 
4. burning, fiery, or hot: the ardent core of a star. 
Synonyms: 1. fervid, eager, impassioned. 2. avid.
Sentence
He's an ardent supporter of the local football team.

Despondent
–adjective feeling or showing profound hopelessness, dejection, discouragement, or gloom: despondent about failing health. 
Synonyms: disheartened, downhearted, melancholy, blue. hopeless.
Antonyms: happy, hopeful.
Sentence
When I get despondent my roommate cheer me up.

Gratis
–adverb
1. without charge or payment; free: The manufacturer provided an extra set of coat buttons gratis. 
–adjective
2. free; gratuitous.
Sentence
I won’t buy the factory even if it is as cheap as a gratis thing.

Converge
–verb (used without object)
1. to tend to meet in a point or line; incline toward each other, as lines that are not parallel.
2. to tend to a common result, conclusion, etc.
3. Mathematics. a. (of a sequence) to have values eventually arbitrarily close to some number; to have a finite limit.
b. (of an infinite series) to have a finite sum; to have a sequence of partial sums that converges.
c. (of an improper integral) to have a finite value.
d. (of a net) to be residually in every neighborhood of some point.
–verb (used with object)
4. to cause to converge.
Synonyms: 1. approach, focus, come together.
Sentence
Good, let’s converge here next Saturday then.

Catastrophic
–noun
1. a sudden and widespread disaster: the catastrophe of war. 
2. any misfortune, mishap, or failure; fiasco: The play was so poor our whole evening was a catastrophe. 
3. a final event or conclusion, usually an unfortunate one; a disastrous end: the great catastrophe of the Old South at Appomattox. 
4. (in a drama) the point at which the circumstances overcome the central motive, introducing the close or conclusion; dénouement. Compare catastasis, epitasis, protasis.
5. Geology. a sudden, violent disturbance, esp. of a part of the surface of the earth; cataclysm.
6. Also called catastrophe function. Mathematics. any of the mathematical functions that describe the discontinuities that are treated in catastrophe theory.
Synonyms: 1. misfortune, calamity. 1, 3. See disaster.
Antonyms: 1, 3. triumph.
Sentence
All the parts are made by our cooperation factories. If this linkage has something wrong, the production will be interrupted. The result is catastrophic.

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