Merciless and Onerous

Merciless adjective - Having or showing a lack of sympathy or tender feelings.

Onerous and merciless are semantically related in tiring topic. In some cases you can use "Onerous" instead an adjective "Merciless".

Nearby Words: merciful, mercilessly, mercifully

Onerous adjective - Difficult to endure.

Merciless and onerous are semantically related in difficult topic. Sometimes you can use "Merciless" instead an adjective "Onerous", if it concerns topics such as tiring.

Nearby Word: onerously