Denshi Jisho — Online Japanese dictionary

やや a little; partially; somewhat; slightly; semi-; -ish; on the ... side; a short time; a while
Adverb, Noun or verb acting prenominally, Usually written using kana alone 
西 せいぜん westward advance
Noun, Suru verb 
ぜんぜん 1: (Obscure term) gradually; by degrees;
2: (Obscure term) the sight of a tall soaring rock;
3: (Obscure term) crying; weeping
Adverb 
とうぜん eastward advance
Noun, Suru verb 

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