thankful
adj.adj. feeling or showing that you are happy and relieved about something good. You use this when you want to say 'thank you' for a kind act or a lucky situation.
adj. feeling or expressing gratitude; appreciative of a benefit or a fortunate circumstance. Often used to convey relief that a negative outcome was avoided.
I am thankful for your help with the project.
After the storm passed without damaging the house, the family felt deeply thankful for their safety.
While the survivors were understandably shaken by the accident, they remained profoundly thankful for the swift response of the emergency services.
From Middle English thankful, from Old English þancful, þancfull (“thoughtful, pleasing, agreeable, pleasant, thankful, grateful”), equivalent to thank + -ful. Compare Old High German undankfol (“unthankful, ungrateful”).
Typically followed by the preposition 'for' when naming the cause of gratitude, or 'that' followed by a clause.
I am thankful of your helpI am thankful for your helpThe adjective thankful takes the preposition 'for', not 'of'.