たやすい・容易いtayasui[3]nakadaka (mid-high)

1. i-adjectiveeasy; simple; light
   彼かれはたやすく彼女かのじょの家いえを探さがすことが出来できた。↗

   He could find her house easily.

• SynonymやさしいNeutralRefers to questions or content that are easy to understand, as in 「易しい問題」; common in daily speech, while 「容易い」 stresses ease of doing and leans written.
• SynonymやすいNeutralAs a suffix it means something is easy to do, as in 「読みやすい」; on its own it is written-leaning and close in sense to 「容易い」.
• Synonym簡単かんたんNeutralThe everyday default: simple and uncomplicated, and also easy to do, as in 「簡単にできる」; the most common word in daily use.
• Synonym簡易かんいWrittenWritten word for simplified or stripped-down, as in 「簡易トイレ」 or 「簡易検査」; stresses a simplified setup rather than ease of doing.
• SynonymシンプルNeutralLoanword for simple and plain; it describes style or appearance and says nothing about how hard something is.
• Synonym平易へいいWrittenWritten word for plain, easy-to-follow language, as in 「平易な言葉」; stresses that content is easy to understand.
• Synonym生易しいなまやさしいNeutralUsually takes a negative and means 'not that simple', as in 「生易しいものではない」; rarely used affirmatively on its own.
• Synonym容易よういWrittenWritten-leaning noun for ease, as in 「容易ではない」; it shares the same root as 「容易い」.
• Synonym安易あんいNeutralSuggests taking the easy way out and is often critical, as in 「安易な考え」 for simplistic, careless thinking.
• Synonym手軽てがるNeutralMeans handy and hassle-free, as in 「手軽な料理」; stresses that little time or effort is needed.
• Synonym楽らくNeutralMeans comfortable and undemanding, as in 「楽な仕事」; stresses freedom from strain rather than simplicity.
• Synonym簡便かんべんWrittenWritten word for convenient and simple; stresses that using something saves time and trouble.
• Synonym安直あんちょくNeutralCritical word for the cheap, overly simple option; implies laziness or sloppiness in choosing the easy route.
• SynonymイージーNeutralLoanword for easy and relaxed; common in speech and carries a light, breezy feel.
• Synonym造作ないぞうさないWrittenWritten phrase meaning something takes no trouble at all; it has an old-fashioned flavor and is rarely used.
• SynonymちょろいCasualColloquial slang for something being a piece of cake; it can carry a dismissive, looking-down tone.
• Synonym軽易けいいWrittenWritten word for light and easy; rare, and in daily speech people say 「簡単」 instead.
• SynonymわけないNeutralMeans effortless, done with no trouble at all, as in 「訳無いことだ」; common in spoken Japanese.
• Synonymお安いおやすいNeutralMostly seen in 「お安い御用」; calls something a trivial favor with a polite, courteous ring.
• Synonym楽チンらくチンCasualCasual slang for easy and comfortable, with a friendly, playful ring; applies to things, work, or methods.
• Synonym手軽いてがるいNeutralMeans handy and effortless but is rarely used; in daily speech people say 「手軽」.
• Antonym難しいむずかしいNeutralThe everyday antonym: difficult or hard; the direct opposite of 「容易い」.
• Antonym困難こんなんWrittenWritten word for difficulty or hardship; the formal opposite of getting something done with ease.

Use 「容易い」 when something can be done with no trouble, as in 「容易いご用だ」. For content that is easy to understand pick 「易しい」, for something simple in structure 「簡単」, for something undemanding or comfortable 「楽」, for taking the easy way out (critical) 「安易」, and for a piece of cake (slang) 「ちょろい」. The everyday opposite is 「難しい」.

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

1. 訳わけ無なくできるさま。容易よういだ。