複合動詞N4
〜やすい
easy to do...
Structure
V-ます形（語幹）+ やすい
Explanation
Attached to the masu-stem of verbs, 〜やすい means something is easy to do (e.g., 書きやすい). It can also indicate a tendency to happen. Conjugates like an い-adjective.
Examples
このペンはとても書きやすいです。
This pen is very easy to write with.
冬は風邪をひきやすいです。
You easily catch colds in winter.
Note
〜やすい can also express a tendency for something to happen. It contrasts with 〜にくい.