apt to (do), liable to, prone to, inclined to, tend to
Verb ます stem + ~
Attached to the stem of a verb, this suffix expresses that someone or something has an undesirable tendency to do an action, or that the action happens frequently.
Used to show a negative habit, frequent occurrence, or inclination to do something unwanted.
最近、約束を忘れ
Lately, I tend to forget my promises.
この電車は遅れ
This train is often late.
This grammar point is strictly used for negative, undesirable tendencies or frequent problems. It is not grammatical to use it for positive tendencies or good habits.
Noun + ~
Attached directly to a noun, it indicates a frequent, usually negative, state or condition.
Expresses that someone or something is prone to a certain state, or that a condition occurs often.
冬は病気
I am prone to illness in the winter.
最近の天気は曇り
The weather lately tends to be cloudy.
Just like with verbs, attaching this to a noun implies an unwanted condition. It cannot be used with nouns that represent positive states.