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Here are some examples and usages:
a- ... moral (concerned with the principles of right and wrong behaviour) ~ amoral (lacking morals, unconcerned with those principles).
dis- ... loyal (firm and constant in one's support for someone or something) ~ disloyal (lacking loyalty or support...)
in- ... secure (certain to remain safe and unthreatened; fixed or fastened). ~ insecure (uncertain or anxious; not firmly fixed).
non- ... violent (someone who uses physical force to hurt damage or kill someone or something). ~ non-violent (someone who uses peaceful means to achieve their objectives).
un- ... tidy (arranged neatly and in order). ~ untidy (not arranged tidily).
All those examples and definitions came from my Oxford Dictionary; it wasn't difficult. Why don't you try the same exercise using other words like (a)typical, (a)political, (dis)courteous, (dis)honest, (in)discreet, (in)tangible, (non-)essential, (non-)standard, (un)common, (un)just. Some simple spade-work and you'll soon get the idea behind negation prefixes.
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