adj.
坚持不懈的；持续的
Her persistent efforts finally led to success in the competition.
同义词: determined, steadfast, tenacious
反义词: temporary, fleeting
adj.
模棱两可的；不明确的
The teacher's instructions were ambiguous, so the students were confused.
同义词: vague, unclear, equivocal
反义词: clear, definite, unambiguous
v.
反驳；与...矛盾
The witness's testimony contradicted the defendant's alibi.
同义词: deny, oppose, refute
反义词: confirm, support, agree