〜限りだ
I feel so (very) …
Emotion adjective (い-adj / な-adj + な) + 限りだ
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限りだ after an emotion adjective means the speaker feels that emotion as strongly as possible: 友達がみんな結婚して、うらやましい限りだ, "all my friends are married, and I'm so envious".
It's for the speaker's own feelings, with words like 嬉しい, 悔しい, 寂しい, 心強い, うらやましい, 情けない and 残念な. The first half usually gives the situation causing the feeling.
It's formal and a little old-fashioned, and 限りです is common in speeches: 皆さんに応援していただき、心強い限りです, "I'm so encouraged by your support".
Don't confuse it with 限り (N3), "as long as", or ばかりだ (N2), "keeps getting (worse)".
Examples
友達がみんな結婚して、うらやましい限りだ。
All my friends are married, and I'm so envious.
大切な試合に負けて、悔しい限りだ。
I'm so frustrated that we lost such an important match.
皆さんに応援していただき、心強い限りです。
I'm so encouraged by all your support.
故郷の町がなくなるとは、寂しい限りだ。
It's so sad that my hometown is disappearing.
優勝できて、嬉しい限りです。
I'm so happy that we won.