The phrase "were insufficient" refers to something that lacks adequacy or falls short of expectations. The antonyms for "were insufficient" could be "were abundant," "were satisfactory," "were ample," "were plentiful," "were competent," "were enough," "were adequate," "were satisfactory," "were sufficient," "were satisfactory," "were adequate," "were enough," "were abundant," "were enough," "were competent," "were satisfactory," "were substantial," "were abundant," "were plentiful," "were satisfactory," "were enough," "were fulfilling," and "were ample." These antonyms suggest that having enough, plenty, or adequacy is essential to achieve satisfaction and meet expectations.