Difficult and Grumbling

Difficult adjective - Requiring considerable physical or mental effort.

Grumbling and difficult are semantically related. In some cases you can use "Grumbling" instead an adjective "Difficult".

Nearby Word: difficulty

Grumbling adjective - Continuous full and low-pitched throbbing sound.

Difficult and grumbling are semantically related. Sometimes you can use "Difficult" instead an adjective "Grumbling".

Nearby Words: grumble, grumpy, grumbled, grumbler