1. Not oppressive.

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

• ynburdensome,
• hnburdensome,
• jnburdensome,
• inburdensome,
• 8nburdensome,
• 7nburdensome,
• ubburdensome,
• umburdensome,
• ujburdensome,
• uhburdensome,
• unvurdensome,
• unnurdensome,
• unhurdensome,
• ungurdensome,
• unbyrdensome,
• unbhrdensome,
• unbjrdensome,
• unbirdensome,
• unb8rdensome,
• unb7rdensome

• unbearable,
• unassuming,
• unwanted,
• unburdens,
• unobtrusive,
• unperceptive,
• Unbusinesslike,
• unburdened.

The adjective form of the word "unburdensome" is "unburdensome". It remains the same in both noun and adjective forms.

The plural form of "Unburdensome" is "Unburdensomes".

The singular form of "unburdensome" is "unburdensomeness".