flighty vs. flinty
Main Entry: flighty
Part of Speech: adjective
Definition: fickle, irresponsible
Synonyms: airheaded, birdbrained, bubbleheaded, capricious, changeable, dingbat, dingdong, dizzy*, effervescent, empty-headed, featherbrained, frivolous, gaga, giddy, harebrained, impetuous, impulsive, inconstant, lightheaded, lively, mercurial, scatterbrained, silly, thoughtless, twit, unbalanced, unstable, unsteady, volatile, whimsical, wild
Antonyms: responsible
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flinty
Part of Speech: adjective
Definition: stern
Synonyms: cruel, firm, hard, inflexible, rigid, steely, stony, unsympathetic, unyielding
Compare to Mr.Jutianjunyan who just became well known for his high mark of TOEIC test, I am lack of his, say,flinty...I may never possess the ability to get a full score in that test. I am impressed by his practice which is edificatory. Since my writing test requires a lot of reading, I may suppose it is a test instead of my own study--set limit of time,score,quantity, etc.
You may found out that flighty has more synonyms than flinty, so is true that more flighty persons than the flinty one.