Denshi Jisho — Online Japanese dictionary

非 ひ 1: fault; error; mistake;
2: going poorly; being disadvantageous; being unfavorable;
3: (Prefix) un-; non-; an-
Common word, Noun 
是非 ぜひ 1: (Usually written using kana alone) certainly; without fail;
2: right and wrong; pros and cons
Common word, Adverb, Noun 
似非 えせ false; would-be; sham; pretended; mock; spurious; pseudo; quasi
Na-adjective, Noun, Prefix 
理非 りひ judgement of right and wrong (judgment)
Noun 
似而非 えせ false; would-be; sham; pretended; mock; spurious; pseudo; quasi
Na-adjective, Noun, Prefix 
先非 せんぴ past sin; past folly
Noun 
前非 ぜんぴ past folly; past sin
Noun 
是非是非 ぜひぜひ certainly; by all means
Common word, Adverb, Usually written using kana alone 
是是非非 ぜぜひひ free and unbiased; fair and just; ruling or judging what's right is right and what's wrong is wrong; calling spade a spade
Noun 
今是昨非 こんぜさくひ complete reversal of values or ways of thinking (over time); What appeared wrong in the past now appears right; realizing and regretting the past errors of one's ways
Expression 

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