やすい details

write + easy to …

kaki yasui

easy to …; prone to

meaning: be easy to write

このペン、太ふとくて書きかきやすいね。

kono pen, futokute kaki yasui ne.

This pen is thick, so it is easy to write with, isn't it. casual

このグラスは薄うすくて割われやすい。

kono gurasu wa usukute wareyasui.

This glass is thin and breaks easily. neutral

Examples

easy to do — the action goes smoothly for whoever attempts it

このペン、太ふとくて書かきやすいね。

kono pen, futokute kakiyasui ne.

This pen is thick, so it is easy to write with, isn't it. casual

この本ほんは字じが大おおきくて読よみやすい。

kono hon wa ji ga ookikute yomiyasui.

This book has large print and is easy to read. neutral

apt to; liable to — the event tends to happen on its own, usually unwelcome

このグラスは薄うすくて割われやすい。

kono gurasu wa usukute wareyasui.

This glass is thin and breaks easily. neutral

季節きせつの変かわり目めは体調たいちょうを崩くずしやすいので、ご自愛じあいください。

kisetsu no kawarime wa taichou o kuzushiyasui node, gojiai kudasai.

One easily falls ill at the change of seasons, so please take care of yourself. formal

Despite the sound, this is 〜易い, not 安い "cheap": 買いやすい means the buying is easy (price, access, whatever), never that the goods are cheap.

にくい
Mirror-image riders on the same masu-stem slot, both conjugating as i-adjectives — swap やすい for にくい and ease flips to resistance with no other change, 割れやすいグラス versus 割れにくいグラス.

すぎる
Same masu-stem slot, different word class out — 飲みすぎる stays a verb and conjugates verbally (飲みすぎた), 飲みやすい becomes an i-adjective (飲みやすかった); parallel surface, divergent endings.