• Basic forms
• 欠く — to lack; to be without / base form
• 欠きます — lacks / masu form
• 欠いた — lacked / ta-form
• 欠いて — lacking and … / te-form
• 欠かない — do not lack / negative
• 欠けば — if (you) lack / conditional
• Common expressions
• 経験を欠く — to lack experience
• 注意を欠く — to lack attention
• More
• 欠こう — let’s lack (rare) / 〜よう form

欠く（かく） is a godan verb. It means to lack something essential, such as experience, care, or balance.

• Basic forms
• 欠ける — to be missing; to be chipped / base form
• 欠けます — is missing / masu form
• 欠けた — was missing; chipped / ta-form
• 欠けて — being missing / te-form
• 欠けない — is not missing / negative
• 欠ければ — if it is missing / conditional
• Common expressions
• 月が欠ける — the moon wanes
• 一部が欠けている — a part is missing
• More
• 欠けている — is missing (state) / progressive

欠ける（かける） is an ichidan verb. It describes something becoming incomplete or partially missing, often naturally.