reliant
adj.needing someone or something else to help you or to work correctly. You use this when you cannot succeed or survive alone.
adj.needing a particular person or thing for support, survival, or successful operation. Often used predicatively after a linking verb.
“The company is very reliant on its main investor.”
“Many small businesses became heavily reliant on government grants during the economic downturn.”
“The region's economy remains dangerously reliant on a single export, making it vulnerable to sudden shifts in global market prices and trade policies.”
Typically takes the preposition 'on' or 'upon'.
Learners often use 'of' by analogy with 'independent of', but 'reliant' always requires 'on' or 'upon'.
“It’s here to stay, and I want my students to understand the stakes of becoming too reliant on this technology.”
“But the law change has riled some business groups, and officials in Morocco, where the call centre sector is heavily reliant on the French market.”
From rely + -ant.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.