Avid
Eager, greedy
Austere
Rigorous, stern, severely simple
Capricious
Subject to whims, changeable
Competent
Capable, skillful, well qualified
Demure
Modest, quietly charming, sedate
Diminutive
Undersized, small
Formidable
Hard to overcome, causing fear or dread
Inexorable
Unyielding, unrelenting
Inscrutable
Mysterious, unfathomable, beyond comprehension
Inveterate
Habitual, deeply established
Melancholy
Gloomy, brooding, sadly thoughtful
Meticulous
Scrupulous about details
Munificent
Very generous, lavish
Opportune
Timely, advantageous, seasonable
Plebeian
Common, ordinary, low class
Precipitous
Very steep
Precocious
Ahead in development
Pugnacious
Quarrelsome, inclined to fight