1. That may be adjusted.

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

• adjustbale,
• adustable,
• ajustable,
• adjustiable,
• adjustble,
• adjustabe,
• adjstable,
• adjsutable,
• ajustible,
• adjustaable,
• djustable,
• adjustabel,
• adjusable,
• asjustable,
• adjustible,
• adlustable,
• adjutable,
• adjusrable,
• ajdustable,
• addjustable

• adjustive,
• adjusted,
• adjustor,
• adjustment,
• adjuster.

The adjective form of "adjustable" is "adjustable".

The plural form of the word "adjustable" is "adjustables".

The singular form of the word "adjustable" is "adjustable". This word does not change whether it is in singular or plural form.