Something out of the ordinary.
No small matter.
Not to be dismissed lightly.
eg:The discovery made by him is something out of the ordinary.
中英俚語俗語來源:元曲選·魔合羅:“人命事關(guān)天關(guān)地,非同小可。”
同義詞:不可輕視 Not to be sneezed at.
反義詞:平淡無奇 Nothing to write home about.