• Basic forms
• 試みる — to attempt; to try / base form
• 試みます — attempt; try / masu form
• 試みた — attempted / ta form
• 試みて — attempt and … / te-form
• 試みない — do not attempt / negative
• 試みれば — if (someone) attempts / conditional
• Common expressions
• 新しい方法を試みる — attempt a new method
• 改革を試みた — attempted reform
• More
• 試みよう — let’s attempt / 〜よう form
• 試みなかった — did not attempt

試みる（こころみる） is an ichidan verb. It is often used in formal or written contexts, meaning “to attempt” something new or challenging, rather than casually trying something.

• Basic forms
• 試す — to try; to test / base form
• 試します — try; test / masu form
• 試した — tried; tested / ta form
• 試して — try and …; test and … / te-form
• 試さない — do not try; do not test / negative
• 試せば — if (you) try / conditional
• 試せ — try it! / imperative
• Other common forms
• 新しい服を試したい — want to try new clothes / 〜たい
• 試せる — can try; can test / potential
• 試せなかった — couldn’t try
• More
• 試そう — let’s try / 〜よう form
• 試している — is trying; is testing

試す（ためす） is a godan verb ending in す. It is commonly used in everyday situations, such as trying food, testing tools, or checking ideas, and feels more casual than 試みる.