inadequate

Strongly lacking the ability to cope.

Feeling completely unable to cope.

Very much lacking the ability to cope.

Feeling entirely unable to cope (more formal).

Somewhat lacking the ability to cope.

Feeling profoundly unable to cope.

Feeling so unable to cope that there is no hope.

Feeling unable to perform or satisfy sexually.

Feeling unable to cope in most situations.

Completely insufficient, used for emphasis.

Totally and entirely insufficient, with no redeeming qualities.

Wholly insufficient, in every way.

Obviously and without a doubt insufficient.

To a considerable degree, very insufficient.

Easy to see or understand that it is insufficient.

Used to emphasize that there is no other way to describe it; it is just insufficient.

Insufficient in a very significant and important way.

Becoming more and more insufficient over time.

Completely and without qualification insufficient; used for strong emphasis.

Entirely insufficient (more formal than 'totally').

Strongly and profoundly insufficient.

Extremely and obviously insufficient, in a shocking way.

So insufficient that there is no hope of improvement.

Insufficient to an extent that deserves pity or scorn.

Used to emphasize how very insufficient something is, expressing sadness or regret.

Very obviously insufficient (formal).

Famous for being insufficient.

To have the personal feeling of being unable to cope.

To not have the competence or ability to handle a situation.

To give the impression of being unable to handle a situation.

The most common and direct way to state something is insufficient.

Similar to 'appear', used to describe something that gives the impression of being insufficient.

To have the opinion that something is insufficient.

Used when something is shown to be insufficient after being tested or used.

To discover or realize that something is insufficient, often after experience.

Used to describe something that seems insufficient.

To form a formal opinion or conclusion that something is insufficient.

Used to describe something that has the appearance of being insufficient.

To consider or think of something in a particular way as being insufficient (more formal).

Indicates that something continues to be insufficient over time.

Indicates a transition into a state of being insufficient.

To believe that something is insufficient.

Used to specify the demand or challenge that one cannot meet.

Used to specify the purpose or need that is not being met.

Used to specify the activity or skill that is performed poorly.