Shirabe
確固不抜

確固かっこ

Common 'taru' adjective Adverb
English jmdict
1
adverb taking the 'to' particle firm;unshakeable;resolute
いずれの会社にも確固たる事業計画がある。
Every company has a firm business plan.
Other forms 確乎 【かっこ】 (rarely used kanji form)
English jmdict
1
nouns which may take the genitive case particle 'no'adjectival nouns or quasi-adjectives (keiyodoshi)noun (common) (futsuumeishi) yojijukugo determined;steadfast;unswerving;unshakable
Other forms 確乎不抜 【かっこふばつ】