invaluable adj.
VERBS be, prove | become | remain | make sb/sth His knowledge of the area made him invaluable. | find sth You will find their help absolutely invaluable.
ADV. absolutely, quite
PREP. for This technology is invaluable for pupils with poor sight. | to Your support has been invaluable to us.
You can also check other dicts: invaluable (English, 中文解释 ), wordnet sense, Collins Definition