1. Improbably.

2. With difficulty.

3. With difficulty; scarcely; harshly; unfavourably.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• hardley,
• hardr,
• hardky,
• hapily,
• hartly,
• hadly,
• harldy,
• harely,
• hayely,
• harsley,
• hazardly,
• hadle,
• hrly,
• boardly,
• harmly,
• heatdly,
• habdle,
• hamily,
• coardly,
• hashly

• hardliner,
• hard lead,
• hardly a,
• hardy,
• hardline,
• hard,
• hartl,
• hurdle,
• hairtail,
• hard-line,
• hardel,
• hard line.

The adjective form of the word "hardly" is "hard".

The plural form of the word "hardly" is "hardlies".

The singular form of the word "hardly" is "hardly" itself. The word does not change in form when used as a singular.