This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

adj. Not sufficient; inadequate.

adj. Not sufficient.

adj. Not sufficient; not enough; inadequate to any need, use, or purpose.

adj. Wanting in strength, power, ability, capacity, or skill; incompetent; incapable; unfit.

Not sufficient; lacking in what is necessary or required; deficient in amount, force, or fitness; inadequate; incompetent: as, insufficient provision or protection; insufficient motives.

adj. of a quantity not able to fulfill a need or requirement

"House members worry about the - what they term insufficient - level of federal subsidies the Senate version would offer the uninsured and an excise tax on so-called "Cadillac" insurance policies."

lean    scant    short    skimpy    inadequate    poor    shy    depleted    low    light   

insufficiently   

inefficient    inadequate    incommensurate    incompetent    scanty    unfit    incapable    unequal    deficient   

Omniscient    beneficent    coefficient    deficient    efficient    inefficient    omniscient    proficient    self-sufficient    sufficient   

inadequate    adequate    sufficient    scanty    ample    inaccurate    inappropriate    untrue    unsatisfactory    deficient