popular  JLPT N3  pronoun  colloquial  usually written using kana alone  noun  noun (generic)  adverb  interjection 

• what
• you-know-what, that thing
• whatsit, whachamacallit, what's-his-name, what's-her-name
• penis, (one's) thing, dick
• (not) at all, (not) in the slightest
• what?, huh?
• hey!, come on!
• oh, no (it's fine), why (it's nothing), oh (certainly not)

popular  gikun or jukujikun  JLPT N5  noun  noun (generic)  adverb 

• today, this day
• these days, recently, nowadays

popular  JLPT N4  noun  noun (generic)  adverb 

• on the way, en route
• in the middle of, midway, halfway

popular  irregular okurigana  JLPT N2  adverb 

• at least

popular  irregular okurigana  rarely used kanji form  JLPT N4  な adjective  adjective (generic)  adverb 

• sure, certain, positive, definite
• reliable, trustworthy, safe, sound, firm, accurate, correct, exact
• If I'm not mistaken, If I remember correctly, If I remember rightly

popular  noun  noun (generic)  noun taking the genitive case particle の  adjective (generic)  adverb 

• as a matter of fact, actually, effectively, in reality, in effect

popular  noun  noun (generic)  adverb 

• previous day, day before, eve, prior day, preceding day

popular  noun  noun (generic)  adverb 

• all days

popular  noun taking the genitive case particle の  adjective (generic)  noun  noun (generic)  adverb  noun or participle taking the aux. verb する 

• current, urgent, pressing, impending
• to confront (an issue), to face (up to something)
• for the meantime, at present

popular  noun  noun (generic)  adverb 

• this season