やすい・易いyasui[2]nakadaka (mid-high)

1. i-adjectiveeasy
   言ゆうは易やすく行おこなうは難がたし。↗

   It's easier said than done.
2. suffix, i-adjectivelikely to ...; have a tendency to ...after -masu stem of verb
   彼かれは人ひとの名前なまえを忘わすれやすい。↗

   He is apt to forget people's name.
3. suffix, i-adjectiveeasy to ...after -masu stem of verb
   悪習あくしゅうは身みにつきやすい。↗

   Bad habits are easy to get into.

• SynonymやさしいNeutralRefers to questions or content being simple and easy to understand; often stands on its own, while 「易い」 mostly works as a suffix, as in 「分かりやすい」.
• Synonym生易しいなまやさしいNeutralUsually in the negative 「生易しくない」, meaning not that easy; 「易い」 mostly appears as a suffix meaning easy to do.
• Synonym簡単かんたんNeutralThe everyday word for 'simple'; stands alone freely, while 「易い」 typically follows a verb to mean easy to do.
• Synonym簡易かんいNeutralMeans simplified or stripped-down, as in 「簡易包装」 — the point is cutting out fuss; 「易い」 mostly works as a suffix meaning easy to do.
• Synonym平易へいいWrittenWritten/formal prose for writing or explanations that are plain and easy to follow; 「易い」 focuses on ease of doing something.
• SynonymたやすいWrittenWritten/formal prose meaning effortless; it can stand alone as an adjective, while 「易い」 mostly works as a suffix for ease or tendency.
• Synonym容易よういWrittenWritten/formal prose for 'easy'; say 「容易に理解できる」, and the negative 「容易ではない」 is common; 「易い」 mostly works as a suffix.
• SynonymイージーNeutralLoanword for easy, also carrying a careless nuance as in 「イージーミス」; 「易い」 has no such negative shade.
• Synonym安易あんいNeutralSuggests carelessness or taking the easy way out, with a negative nuance; 「易い」 is a neutral 'easy'.
• Synonym造作ないぞうさないWrittenWritten/formal prose for something that takes no trouble, done effortlessly; rare — say 「簡単」 in daily speech, while 「易い」 mostly serves as a suffix.
• SynonymちょろいCasualColloquial slang for something easily dealt with, a piece of cake; 「易い」 is more neutral.
• SynonymわけないCasualColloquial for taking no effort at all; it can also mean 'impossible, no way', while 「易い」 mostly works as a suffix.
• Related楽らくNeutralCovers comfort and ease, stressing that something takes little effort; 「易い」 stresses low difficulty, being easy to do.
• RelatedシンプルNeutralLoanword for simple and unadorned, stressing lack of complexity; 「易い」 stresses low difficulty.
• Related手軽てがるNeutralMeans handy and hassle-free, as in 「手軽な料理」; 「易い」 works as a suffix meaning easy to do.
• Related簡便かんべんWrittenWritten/formal prose for convenient and simple; 「易い」 stresses low difficulty, being easy to do.
• Related安直あんちょくNeutralUsually criticizes overly simple, shortcut thinking, as in 「安直な発想」; can also mean cheap in price; 「易い」 only says something is easy to do.
• Related単純たんじゅんNeutralMeans simple in the sense of uncomplicated structure; 「易い」 stresses low difficulty.
• Related軽易けいいWrittenWritten/formal prose for light and simple; rare — normally say 「簡単」, and use the suffix 「〜やすい」 for ease of doing.
• Relatedお安いおやすいCasualColloquial, fixed in the phrase 「お安い御用」 ('a trifling favor'); its use differs from the suffix 「〜やすい」.
• Related楽チンらくチンCasualColloquial slang for comfortable and effortless, casual in tone; 「易い」 stresses low difficulty, being easy to do.
• Antonym難しいむずかしいNeutralThe antonym 'difficult'; as a suffix, the counterpart of 「〜やすい」 is 「〜にくい」.
• Antonym困難こんなんWrittenWritten/formal prose for difficulty or hardship; the counterpart of 「易い」 in the sense of easy to accomplish.

To say something is easy to do or tends to happen, attach 「〜やすい」 to the verb, as in 「分かりやすい」「壊れやすい」. For 'simple' on its own use 「易しい」 or 「簡単」; for effortless comfort use 「楽」; for 'difficult' use 「難しい」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. （やや古いにしえ）行おこなうことにさほどの労力ろうりょくを使つかわなくてもよい様子ようす。容易よういである。
2. （動詞どうしなどの連用形れんようけいに接続せつぞくして）たやすい。容易よういだ。
3. （動詞どうしなどの連用形れんようけいに接続せつぞくして）すぐにそうなる。する傾向けいこうにある。