忘わすれがち

na-adjective, noun which may take the genitive case particle 'no'

forgetful; prone to forgetting; negligent

Describes a tendency to forget things or be inattentive. Often used with ～になる or as a な-adjective modifying a person or behavior.

• 最さい近きん、忘わすれがちになってきた。

  Lately I've become forgetful.

• 彼かれは忘わすれがちな性せい格かくだ。

  He has a forgetful nature.