1. Not liable to sin.

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

• impeccalbe,
• immpecable,
• immpeccable,
• imperiable,
• impacable,
• inpeccable,
• impectably,
• implaccable,
• impreccable,
• empeccable,
• impeciably,
• impecciable,
• impeciable,
• impeccibly,
• impeccabe,
• inpecable,
• impectable,
• impermable,
• inpeccably,
• impecible

• impassable,
• impeccant,
• impeccably,
• impugnable,
• imbecile.

The adjective form of the word "impeccable" is "impeccable" itself.

The plural form of the word "impeccable" is "impeccables".

The singular form of the word "impeccable" is "impeccability"