1. In a tight manner.

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

• hightly,
• tightin,
• titly,
• tigtly,
• tighly,
• lightely,
• birghtly,
• bightly,
• rightley,
• digitly,
• tightr,
• thightly,
• tightn,
• tighty,
• mightely,
• tighlty,
• tightely,
• tightley,
• tigthly,
• lightyly

The adjective form of "tightly" is "tight".

The plural form of the word "tightly" remains the same; it does not change in the plural form.

The singular form of the word "tightly" is "tight"