1. With great expense.

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

• expensivest,
• estensively,
• extensivly,
• exsesively,
• extesively,
• extensievely,
• excesively,
• extnsively,
• extrensively,
• extencively,
• extensiveley,
• exstensively,
• extensivlly,
• extenstively,
• expensives,
• expensivly,
• extensivtly,
• extensivily,
• explisively,
• extinsively

• expansively,
• expansiveness,
• expansile,
• expansive,
• expending,
• expensiveness,
• expansivity,
• expansive bit,
• expensive.

The adjective form of the word "expensively" is "expensive".

The plural form of the word "expensively" is "expensives".

The singular form of the word "expensively" is "expensiveness"