1. Want of aptitude.

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

• unaptitude,
• jnaptitude,
• knaptitude,
• onaptitude,
• 9naptitude,
• 8naptitude,
• ibaptitude,
• imaptitude,
• ijaptitude,
• ihaptitude,
• inzptitude,
• insptitude,
• inwptitude,
• inqptitude,
• inaotitude,
• inaltitude,
• inapitude,
• innaptitude,
• inapptitude,
• ineptitude

• input device,
• ineptitude,
• inhabited,
• inaptness,
• inhabitable,
• inpatient,
• inhabitant.

The adjective form of the word "inaptitude" is "inapt".

The plural of the "inaptitude" can be the "inaptitudes".

The singular of the "inaptitude" can be the "inaptitude".