Difficult and Niggling

Difficult adjective - Requiring considerable physical or mental effort.

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

Nearby Word: difficulty

Niggling adjective - So small or unimportant as to warrant little or no attention.

Difficult and niggling are semantically related. Sometimes you can use "Difficult" instead an adjective "Niggling".

Nearby Word: niggled