A quick and penetrating intelligence:
— I admired the keenness of his mind.

synonyms: acuity, acuteness, sharpness.

Roget 171: energy, physical energy, force, power etc. 157; keenness etc. adj.; intensity, vigor, strength, elasticity; go; high pressure; fire; rush.    acrimony, acritude^†; causiticity^†, virulence; poignancy; harshness etc. adj.; severity, edge, point; pungency etc. 392.    cantharides; seasoning etc. (condiment) 393.    activity, agitation, effervescence; ferment, fermentation; ebullition, splutter, perturbation, stir, bustle; voluntary energy etc. 682; quicksilver.    resolution etc. (mental energy) 604; exertion etc. (effort) 686; excitation etc. (mental) 824.    ... show more

Dutch: gehaaid, pienter, scherpte, luciditeit, scherpzinnigheid, schranderheid, spitsheid, vernuft
Polish: przenikliwość

A positive feeling of wanting to push ahead with something.

synonyms: avidity, avidness, eagerness.

Roget 865: desire, wish, fancy, fantasy; want, need, exigency.    mind, inclination, leaning, bent, animus, partiality, penchant, predilection; propensity etc. 820; willingness etc. 602; liking, love, fondness, relish.    longing, hankering, inkling; solicitude, anxiety; yearning, coveting; aspiration, ambition, vaulting ambition; eagerness, zeal, ardor, empressement [Fr.], breathless impatience, overanxiety; impetuosity, etc. 825.    appetite, appetition^†, appetence^†, appetency^†; sharp appetite, keenness, hunger, stomach, twist; thirst, thirstiness; drouth, mouthwatering; itch, itching; prurience, cacoethes [Lat.], cupidity, lust, concupiscence.    edge of appetite, edge of hunger; torment of Tantalus; sweet tooth, lickerish tooth^†; itching palm; longing eye, wistful eye, sheep's eye.    [excessive desire for money] greed etc. 817.1. voracity etc. (gluttony) 957.    passion, rage, furore^†, mania, manie^†; inextinguishable desire; dipsomania, kleptomania.    [Person who desires] lover, amateur, votary, devotee, aspirant, solicitant, candidate, applicant, supplicant; cormorant etc. 957.    [Object of desire] desideratum; want etc. (requirement) 630; a consummation devoutly to be wished;" attraction, magnet, allurement, fancy, temptation, seduction, fascination, prestige, height of one's ambition, idol; whim, whimsy, whimsey^†; maggot; hobby, hobby-horse.    Fortunatus's cap; wishing cap, wishing stone, wishing well.    ... show more

Dutch: impatience, enthousiasme, gretigheid, begeerte
Polish: skwapliwość

Thinness of edge or fineness of point.

synonym: sharpness.

Dutch: gescherptheid, scherpheid
Polish: ostrość