dur, su, nir & etc.

dur, su, nir & etc.¶

Three otherwise common prefixes, dur- su- nir- as well as sa- kā- kad- ku- are not used with verbs, only with nouns and adjectives

dur-¶

bad, difficult, unwholesome, negative, poor, ill, mean


√man	to think	domanassa	mental suffering
√vac	to speak	dubbacana	harsh words, abuse
√bal	to be strong	dubbala	frail, weak, feeble
√var	to cover	dubbaṇṇa	ugly, discolored
√bhar	to support	dubbhara	difficult to support
√bhikkh	to beg	dubbhikkha	famine
√car	to act	duccarita	misconduct
√chad	to hide	ducchanna	badly thatched
√dam	to tame	duddama	hard to tame
√dis	to see	duddasa	difficult to see
√gam	to go	duggati	hell, bad place

su-¶

good, well, thoroughly, easily, auspiciously, abundance


√man	to think	somanassa	happiness, good mind
√bhar	to support	subhara	easy to support
√bhās	to speak	subhāsita	well spoken
√bhū	to be	subhāvita	fully developed
√car	to act	sucarita	good conduct
√dam	to tame	sudanta	well tamed
√dis	to see	sudiṭṭha	well-seen

nir-¶

not, without, no, negative


√van	to desire	nibbana	without craving
√chā	to be hungry	nicchāta	satisfied, not hungry
√dar	to fear	niddara	carefree, fearless
√ghus	to shout	nigghosa	silent
√kaṅkh	to doubt	nikkaṅkha	doubtless, confident
√mal	to stain	nimmala	spotless
√pī	to love	nippītika	without delight

kā- kad- ku¶

bad, negative, small, mean


kā	lavaṇa	kālavaṇa¹⁸	pinch of salt
kā	purisa	kāpurisa	evil man
kad	ariya	kadariya	miserly, stingy
kad	anna	kadanna	rotten food
kad	asana	kadasana¹⁹	little food
ku	√sad + ya	kosajja	laziness, inactivity
ku	√kar + ya	kukkucca	misbehaviour, remorse
ku	magga	kummagga	wrong road, bad way
ku	nadī	kunnadī	small stream
ku	sobbha	kusobbha	small pool

Not a textual example

sa-¶

with, having, affected with


bhaya	fear	sabhaya	dangerous
kaṇṭaka	thorn	sakaṇṭaka	problematic; with thorns
bala	strength	sabala	with strength; having power
dukkha	pain	sadukkha	afflicted; with pain