Practice JLPTHow to tell them apart
っぽい describes a quality or flavor that something or someone has — cheapish, womanish, easy to — and is neutral or even positive. がち describes a tendency that is usually undesirable, like a watch running slow or houses being empty. The key contrast is tone: 安っぽいソファ just labels a characteristic, while 遅れがち implies a negative habit you wish weren't so. Swapping them sounds odd because っぽい doesn't carry the negative nuance がち relies on.
- っぽい Use っぽい when labeling a characteristic or quality, not a bad habit.
- がち Use がち when describing an undesirable tendency you want to avoid.
っぽい ppoi
Tend to be/-ish
Apt to; easy to; -ish; -like | A suffix that indicates someone/something has some distinctive characteristic or an attribute identified by a noun, an adjective, or a verb to which the suffix is attached.
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あなた、こんな安っぽいソファを買ってきてどうするの？
What are you going to do with this cheapish sofa that you bought?
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あの女優は実に女っぽいから好きだ。
I like the actress, because she is so womanish.
がち gachi
Tend to (negative)
Tend to; be prone to; be apt to; be liable to; be subject to; often | A suffix to express an undesirable tendency in someone or something.
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この時計は最近 遅れがちだ。
This watch tends to run slow these days.
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この辺りは昼間留守がちの家が多い。
Around here many people are often away from their houses during the day. (literally: Around here there are many houses which residents are often away from during the day.)
っぽい and がち are both JLPT N3 grammar points that Japanese learners often mix up. This page compares them side by side — meanings, usage and example sentences — so you can tell them apart.