Collocations for sufficient - adj.

be, prove, seem
consider sth, deem sth, regard sth as, see sth as
Do you really regard that explanation as sufficient?

quite
barely, hardly
Our budget is hardly sufficient to pay people, let alone buy any new equipment.

just

for
The salary proved sufficient for his needs.

Sufficient is used with these nouns:
accuracy, cause, clarity, compensation, condition, consideration, evidence, explanation, flexibility, food, force, fund, funding, ground, incentive, income, indication, justification, leverage, magnitude, number, proof, quantity, reason, recompense, reserve, resource, rest, room, safeguard, size, space, supply, support, understanding, weight